Each year, Wild Bird Research Group encounters dozens of bird species through our research, monitoring, and public outreach work. When our community of supporters selected the Cedar Waxwing as our first official Bird of the Year, it felt like a natural choice — a species that is both visually striking and ecologically revealing.
At Fiddler’s Creek Preserve, where WBRG has conducted long-term songbird monitoring for years, Cedar Waxwings are a species we look forward to encountering — though not always predictably. Some years, flocks pass through in impressive numbers; other years, they’re noticeably scarce. These fluctuations are part of what makes Cedar Waxwings such an intriguing species to study. Their presence is closely tied to seasonal conditions, weather patterns, and — perhaps most importantly — the availability of fruit.
Unlike many songbirds that rush to breed early in spring, Cedar Waxwings delay nesting until later in the summer. This timing aligns with peak fruit abundance, allowing adults to meet the energetic demands of raising young when food resources are most plentiful. In New Jersey, where seasonal weather variability has become more pronounced, this strategy makes Cedar Waxwings a compelling indicator of how changing conditions can influence breeding success and local abundance from year to year.
Fruit, Insects, and the Timing of Breeding
Cedar Waxwings are often described as fruit specialists — and for good reason. Berries make up a large portion of their diet throughout much of the year. But when it comes to raising young, waxwings reveal a more nuanced feeding strategy.
Newly hatched nestlings require protein to grow, and during the early stages of development, adult Cedar Waxwings rely heavily on insects to meet those nutritional needs. As nestlings mature, parents gradually introduce fruit into their diet. By the time young birds are preparing to fledge, fruit can become a major food source.
This gradual shift from insects to fruit helps explain why Cedar Waxwings breed later than most songbirds. Their reproductive success depends not only on insect availability early on, but also on a reliable supply of berries later in the season. Years with strong fruit production often coincide with higher numbers of waxwings, while poor fruiting years can lead to noticeably fewer birds on the landscape.
When Diet Changes Plumage: Yellow and Orange Tail Tips
One of the most visually fascinating aspects of Cedar Waxwing biology is how their diet can directly influence their appearance. The bright yellow band at the tip of a waxwing’s tail is produced by pigments derived from the fruits they consume. In areas where certain invasive honeysuckle species are abundant, waxwings feeding heavily on those berries may develop orange-tinted tail tips instead — a vivid reminder that what birds eat can shape how they look.
This phenomenon has been observed most often in years when waxwings congregate in large numbers to exploit abundant fruit sources, especially when adults are feeding both themselves and their young. It’s a subtle but striking example of how changes in plant communities — native or invasive — can ripple through bird populations in unexpected ways.
The Mystery of the Wax Tips
Perhaps no feature is more closely associated with Cedar Waxwings than the small, red, wax-like tips found on the ends of their wing feathers. These “wax tips” are rare in the bird world and are shared by only a handful of closely related species.
The number and size of these waxy tips tend to increase with age, making them useful clues for aging birds during banding and research efforts. While their exact function is still debated, many researchers believe they play a role in social signaling — potentially advertising age, experience, or overall condition within flocks.
For a species that spends much of its life moving in tight-knit groups, subtle visual cues like these may be especially important for maintaining social structure and mate selection.
Coming Up Next: Telling Males and Females Apart
At first glance, male and female Cedar Waxwings look nearly identical — a challenge even for experienced birders. But with a closer look, and especially with birds in hand during banding, subtle differences begin to emerge. Features such as wax tip development, facial markings, and tail band characteristics can offer valuable clues.
In our next Bird of the Year article, we’ll take a deeper dive into how researchers distinguish male and female Cedar Waxwings, both during field studies and — in some cases — through careful observation of large flocks. It’s a fascinating glimpse into how much detail can be hidden within one of North America’s most elegant songbirds.
