The practice of distinguishing between two very similar, closely related species within the same genus is a fundamental skill in biological observation.
This comparative analysis relies on identifying subtle yet consistent differences in physical characteristics, vocalizations, range, and behavior.
For instance, birdwatchers often learn to differentiate between the Downy Woodpecker and the Hairy Woodpecker by noting variations in bill size relative to head size and the pattern of markings on their outer tail feathers.
Similarly, distinguishing between a Sharp-shinned Hawk and a Cooper’s Hawk requires careful observation of head shape, tail feather length, and flight style.
This process of detailed comparison is essential for accurate species identification, contributing to citizen science data and a deeper appreciation for biodiversity.
The core of this skill involves moving beyond general impressions to focus on specific, diagnostic features, often referred to as field marks.
These marks are the reliable clues that separate one species from its look-alike counterpart, allowing for confident identification even under challenging field conditions.
Developing this expertise requires practice, patience, and a thorough understanding of what characteristics to look for in each specific case.
The ability to make these fine distinctions elevates a casual observer to a knowledgeable naturalist, capable of contributing valuable data to ecological studies and conservation efforts.
cedar vs bohemian waxwing
The waxwings, belonging to the family Bombycillidae, are a group of passerine birds known for their sleek, silky plumage, distinctive crests, and gregarious nature.
Two species, the Cedar Waxwing (Bombycilla cedrorum) and the Bohemian Waxwing (Bombycilla garrulus), are found in North America and present a classic identification challenge for bird enthusiasts.
While they share a similar overall appearance and a strong preference for a fruit-based diet, several key differences allow for their accurate separation.
Understanding these distinctions is crucial for anyone hoping to correctly identify these elegant birds.
A primary point of comparison is their geographic range and seasonal occurrence.
The Cedar Waxwing is the more widespread of the two in North America, breeding across the northern United States and southern Canada and wintering throughout the U.S., Mexico, and into Central America.
In contrast, the Bohemian Waxwing is a more northerly species with a Holarctic distribution, breeding in the boreal forests of North America and Eurasia.
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During the winter, it moves southward in nomadic flocks, sometimes “irrupting” into the northern United States, where its range can overlap with the Cedar Waxwing, creating opportunities for direct comparison.
Overall body coloration provides the first major visual clue. The Cedar Waxwing exhibits a warm, brownish-tan hue on its head, chest, and back, which gradually fades into a soft gray on the wings and rump.
The Bohemian Waxwing, conversely, is predominantly a cool, slate-gray bird, lacking the extensive brown tones of its relative.
This fundamental difference in color palette gives the Bohemian a more frosted or wintry appearance, which is often immediately noticeable even from a distance.
One of the most reliable field marks for separating the two species is the color of the belly.
The Cedar Waxwing has a pale, lemon-yellow wash on its lower breast and belly, which provides a gentle contrast to the brown of its chest.
The Bohemian Waxwing, however, has a grayish or buff-gray belly that blends more uniformly with the rest of its underparts.
This distinction is clear in good lighting and serves as a quick and effective way to sort the two species when they are seen from the front or side.
Perhaps the most definitive diagnostic feature is the color of the undertail covertsthe small, fluffy feathers located beneath the base of the tail.
In the Cedar Waxwing, these feathers are white or a faint off-white, offering little contrast with the pale belly. The Bohemian Waxwing, on the other hand, possesses rich, cinnamon-rufous or rusty-red undertail coverts.
This patch of warm color is striking against its otherwise cool gray plumage and is a conclusive identifier if a clear view of the bird’s underside is obtained.
Wing markings also offer valuable clues, particularly on the Bohemian Waxwing. While both species have the eponymous red, waxy tips on their secondary feathers, the Bohemian Waxwing boasts more elaborate and colorful wing patterns.
It typically displays a bold white wing bar and crisp, bright yellow edges on its primary flight feathers, creating a distinct and complex pattern.
The Cedar Waxwing’s wings are much plainer, lacking these prominent white and yellow markings, which makes the wings of a Bohemian appear more decorated and visually striking.
Subtle differences exist in their size and structure as well.
The Bohemian Waxwing is a larger, stockier bird, often compared in size to an American Robin, whereas the Cedar Waxwing is more slender and closer in size to a House Sparrow.
This size difference can be difficult to judge on a lone bird but becomes apparent when the two species are seen together or in proximity to other familiar birds.
The Bohemians larger size contributes to its more robust and powerful appearance.
Vocalizations can also aid in identification, though the calls of both species are high-pitched and trilling.
The call of the Cedar Waxwing is a very high, thin, and almost insect-like trill, often described as a “zeee.” The Bohemian Waxwing’s call is similar in quality but is noticeably lower in pitch and has a more vibrant, rattling character.
With practice, an observer can learn to distinguish the slightly harsher, more rolling call of the Bohemian from the finer, smoother call of the Cedar.
Finally, flock behavior can provide circumstantial evidence. Both species are highly social and travel in flocks, especially outside the breeding season.
However, Bohemian Waxwings are known for forming exceptionally large and nomadic winter flocks that can number in the hundreds or even thousands.
While Cedar Waxwings also form large flocks, the appearance of a massive, roving flock of waxwings in the northern states during winter is more indicative of the Bohemian species, which undertakes these large-scale irruptive movements in search of fruit.
Key Distinctions for Accurate Identification
- Undertail Covert Color: This is arguably the most reliable and conclusive field mark for separating the two species. The Bohemian Waxwing displays a rich, rusty-cinnamon color on the feathers under its tail, which stands out dramatically against its gray body. In contrast, the Cedar Waxwing has plain white or off-white undertail coverts that blend with its pale belly. If an observer can get a clear view of this part of the bird, the identification can be made with a very high degree of confidence.
- Belly and Breast Coloration: The overall color of the underparts provides a quick sorting mechanism. Cedar Waxwings have a soft, pale yellow wash across their belly that contrasts with a warmer brown on the breast. Bohemians lack this yellow, instead showing a more uniform gray or buff-gray on their belly and breast. This difference in color gives the Cedar Waxwing a warmer, more colorful appearance below, while the Bohemian appears cooler and more muted.
- Overall Body Tone: A general impression of color can be very helpful, especially at a distance. The Cedar Waxwing is fundamentally a brownish bird, particularly on its head, crest, and back. The Bohemian Waxwing is a distinctly grayish bird, with a cooler, more uniform slate-gray plumage dominating its body. This difference is analogous to comparing a warm, earthy tone with a cool, stony one and is a primary visual separator.
- Wing Pattern Complexity: The wings of the Bohemian Waxwing are significantly more patterned and colorful than those of the Cedar Waxwing. Bohemians feature distinct white patches on the wing coverts and bold, bright yellow edging on the primary flight feathers. These markings create a complex, decorated look. The Cedar Waxwing’s wings are much simpler and grayer, lacking these prominent white and yellow accents, making them appear plainer in comparison.
- Geographic Location and Season: Knowing where and when a waxwing is observed is a critical piece of the puzzle. During the summer breeding season, any waxwing seen in the majority of the northern United States is almost certain to be a Cedar Waxwing. Bohemians are only likely to be encountered in the U.S. during winter, primarily in the northern tier of states, when they move south from their boreal breeding grounds in search of food.
- Physical Size and Girth: There is a noticeable size difference between the two species. The Bohemian Waxwing is a larger, plumper, and more robust bird, often described as being robin-sized. The Cedar Waxwing is smaller, slimmer, and more delicate in its proportions, being closer to the size of a sparrow. This difference is most apparent when they are seen side-by-side but can also be judged against other common birds in the vicinity.
- Vocal Quality: For those who practice identification by ear, the calls are subtly but consistently different. Both produce high-pitched trills, but the Bohemian’s call is lower-pitched and has a distinctive rattling or buzzing quality. The Cedar Waxwing’s call is higher, thinner, and often described as a smoother, more piercing “zeee” sound. Learning these nuances can allow for identification even when the birds are not clearly visible.
- Face Mask and Throat Patch: Both species have a black mask through the eye and a black patch on the throat, but there are subtle differences. On the Bohemian Waxwing, the black throat patch is often crisply defined and bordered by white at its lower edge. The Cedar Waxwing’s throat patch tends to be smaller and may blend more softly into the brown of the chest without such a sharp border, though this can be a variable and less reliable mark than others.
Practical Tips for Field Identification
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Focus on the Underside First
When encountering a flock of waxwings, make it a priority to get a view of the underside of one of the birds.
The stark contrast between the rusty-red undertail coverts of the Bohemian and the white ones of the Cedar is the single most effective way to confirm an identification.
Even a brief, clear glimpse of this area can be more valuable than a prolonged, poorly lit view of the bird’s back.
Position oneself to see the birds as they fly overhead or as they perch and stretch.
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Use Binoculars to Assess Wing Details
A good pair of binoculars is essential for observing the finer details that separate these species. Pay close attention to the wings of a perched bird.
Look for the presence or absence of the bold white and bright yellow markings characteristic of the Bohemian Waxwing.
The complexity of the wing pattern on a Bohemian is quite striking when seen well and is a very reliable indicator that differentiates it from the much plainer-winged Cedar Waxwing.
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Consult Range Maps Beforehand
Before heading into the field, check a reliable field guide or an online resource like the Cornell Lab of Ornithology’s “All About Birds” or eBird to understand the expected species for the specific location and time of year.
In most of the United States for most of the year, a waxwing will be a Cedar Waxwing.
Knowing this provides a baseline expectation, making a potential Bohemian Waxwing sighting more noteworthy and prompting a more careful examination to confirm its identity.
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Compare with Familiar Birds for Size
Judging the size of a lone bird can be deceptive, so use other nearby birds as a reference.
If the waxwing is perched near an American Robin or a European Starling and appears similar in bulk, it is more likely to be a Bohemian.
If it appears closer in size to a House Sparrow or a finch, it is almost certainly a Cedar. This comparative approach helps to ground size estimations and avoid misjudgment.
Exploring the World of Waxwings
The diet of waxwings is a fascinating aspect of their biology, as they are among the most specialized frugivores, or fruit-eaters, in the avian world.
During the fall and winter, their diet consists almost exclusively of sugary fruits and berries from plants like cedar, juniper, mountain ash, and hawthorn.
This reliance on fruit dictates their nomadic behavior, as flocks must constantly seek out new areas with abundant food sources.
Their digestive systems are highly efficient at processing sugar, allowing them to consume vast quantities of berries in a short period.
This specialized diet occasionally leads to a peculiar phenomenon: intoxication. When late-season berries begin to ferment, the natural sugars convert to alcohol.
Waxwings, consuming large amounts of these fermented fruits, can become inebriated, leading to disoriented flight and collisions with windows and other structures.
While often sensationalized, this is a real and sometimes fatal risk for the birds, highlighting a unique ecological interaction between the birds and their primary food source.
The name “waxwing” derives from the brilliant red, wax-like tips on the ends of their secondary wing feathers.
The exact function of these waxy appendages is still a subject of scientific inquiry, but they are believed to be related to courtship and mate selection.
Studies suggest that the number and size of these tips increase with the bird’s age and may signal its health and fitness to potential mates.
This unique ornamental feature is a defining characteristic of the entire Bombycillidae family.
Irruptive movements are a hallmark of the Bohemian Waxwing’s life cycle. Unlike predictable, seasonal migration, irruptions are irregular mass movements of a species far south of its typical winter range.
These events are primarily driven by the failure of the berry crop in their northern boreal habitats.
When food is scarce in the north, massive flocks of Bohemians are forced to wander widely in search of sustenance, leading to exciting and unpredictable sightings for birdwatchers in the northern United States.
Both waxwing species play an important ecological role as seed dispersers. After consuming berries, they travel to new locations and excrete the undigested seeds in their droppings, effectively “planting” new trees and shrubs.
This process is vital for the regeneration and expansion of many native, fruit-bearing plant species.
The relationship between waxwings and these plants is a classic example of mutualism, where both the bird and the plant benefit from the interaction.
The breeding biology of waxwings is timed to coincide with the availability of summer resources.
While they still consume fruit, their diet during the nesting season is supplemented with protein-rich insects, which are crucial for the growth of their young.
They are often late nesters compared to other songbirds, delaying breeding until late summer when wild fruits begin to ripen, ensuring a plentiful food supply for their fledglings.
Their nests are typically well-concealed open cups built in the branches of trees.
Attracting waxwings to a backyard or garden is a rewarding endeavor for nature lovers. The key is to plant native species of trees and shrubs that produce the small, sugary fruits they prefer.
Serviceberry, winterberry, dogwood, juniper, and crabapple are all excellent choices.
Providing a source of clean water, especially a heated birdbath in winter, can also be a major attraction for these thirsty, fruit-eating birds, offering spectacular views of their silky plumage and social interactions.
Despite their current stable populations, waxwings face long-term threats common to many bird species. Habitat loss, particularly the clearing of the boreal forests where Bohemians breed, is a significant concern.
Climate change may also impact the timing and abundance of fruit crops, potentially creating a mismatch between the birds’ needs and food availability.
Ongoing monitoring and conservation of their habitats are essential to ensure these elegant birds continue to thrive.
Juvenile waxwings present an additional identification challenge, as their plumage is much duller and more streaked than that of adults.
A young Cedar Waxwing can appear quite grayish and heavily streaked on its underparts, potentially causing confusion.
However, even on juvenile birds, the key field marks hold true: a young Bohemian will still be larger and will show the tell-tale rufous undertail coverts, while a young Cedar will be smaller with white undertail coverts, allowing for accurate identification with a careful look.
The social structure of waxwing flocks is highly organized and cooperative. They are not territorial outside of the immediate nesting area and often feed peacefully in large groups.
This gregariousness is a survival strategy, as more eyes in a flock mean better detection of predators like hawks and shrikes.
Their coordinated, graceful flight as a flock is a remarkable sight, showcasing the deep-seated social nature of these captivating birds.
Frequently Asked Questions
John asks: “Why are they called ‘waxwings’ in the first place? Do their wings have actual wax on them?”
Professional’s Answer: That’s an excellent question, John. They are called waxwings because of the unique, brilliant red tips found on the ends of some of their wing feathers, specifically the secondaries.
These tips look as if they have been dipped in red sealing wax. They are not made of actual wax but are flattened extensions of the feather shaft colored by a pigment called astaxanthin.
It’s a fascinating and beautiful feature that is unique to this family of birds.
Sarah asks: “Is it possible to see both Cedar and Bohemian Waxwings in the same flock at the same time?”
Professional’s Answer: Hello, Sarah. Yes, it is absolutely possible, and it’s a fantastic opportunity for birdwatchers.
This typically occurs during the winter in the northern United States, where the wintering range of the Cedar Waxwing overlaps with the irruptive range of the Bohemian Waxwing.
Mixed flocks can often be found foraging together in the same fruit-bearing tree, which provides an ideal situation for direct comparison of their size, color, and field marks.
Ali asks: “I saw a waxwing during the summer in Ohio. Which one was it most likely to be?”
Professional’s Answer: Hi Ali, that’s a great observation. Given the location and time of year, the bird you saw was almost certainly a Cedar Waxwing.
The Bohemian Waxwing’s breeding range is far to the north in the boreal forests of Canada and Alaska. They are strictly winter visitors to the United States.
The Cedar Waxwing, however, breeds widely across the northern half of the U.S., including Ohio, making it the expected species there during the summer months.
Maria asks: “Do they only eat berries? I’m wondering if they eat insects as well.”
Professional’s Answer: That’s a very insightful question, Maria. While waxwings are famous for their fruit-heavy diet, especially in fall and winter, they are not exclusively frugivores.
During the spring and summer, particularly during the breeding season, they become adept flycatchers. They actively hunt and eat insects on the wing, catching everything from mayflies to dragonflies.
This protein is essential for the healthy growth of their nestlings.
David asks: “Is one species more aggressive than the other when they are feeding together?”
Professional’s Answer: Hello, David. Generally, both waxwing species are known for being quite gentle and non-aggressive, even when feeding in large, dense flocks.
However, when there is a direct interaction, the larger and bulkier Bohemian Waxwing may displace the smaller Cedar Waxwing from a preferred feeding spot.
This is a common dynamic among birds where size often determines dominance, but it’s typically subtle and not characterized by overt aggression.
Chen asks: “The bird I saw had a yellow belly but seemed very gray overall. How can I be sure which one it was?”
Professional’s Answer: Hi Chen, that can be a tricky situation, as lighting can greatly affect color perception. The most reliable way to resolve this is to focus on the undertail coverts.
A Cedar Waxwing, even if it appears grayish in poor light, will have white undertail coverts.
A Bohemian Waxwing will always have rich, cinnamon-rufous undertail coverts, a feature that is quite distinct regardless of the overall body color impression.
If you can get a look at that specific area, it will provide a definitive answer.
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