Tag: "songbirds" at biology news

Study Shows Songbirds Switch From Bugs To Berries To Fuel Fall Migration

... grueling migration. Thestudy also shows migrating songbirds seek out fruit-laden "refueling" siteswhere they c...re, are extremely important to many species oftiny songbirds that travel thousands of miles every fall from breeding sites inthe United States and Canada to wint...

Among Wrens, Moms Teach Daughters To Call, Dads Teach Sons, Study Reveals

...e a comparable social system. "Almost all songbirds that have been studied so far learn their songsfrom unrelated neighbors," Price said. "This new system of the stripe-backedwrens makes you wonder. Why aren't the daughters learning from their fathers,and why aren't sons learning from their mothers? W...

Birds Sing The 'Story Of Their Lives,' Theorize Duke Biologists

...owicki@duke.edu DURHAM, N.C. -- When male songbirds sing to attract mates, the qualityof their song mi...ss a nestling faces during the rapid growth period songbirds typically faceearly in life, or perhaps stress resulting from the effects of parasites. "Mal...

Fewer Songbirds May Be Result Of Forest Fragmentation Across The American South, New Study Suggests

...oing something else: causing a decline inmigratory songbirds in the American South. In a new study at t...cline in some species. "Some 20 percent of songbirds species are ground-nesters, from ovenbirdsto Black-and-White Warblers, and many are in decline," sai...

Melatonin Shapes Brain Structure In Songbirds

...wth of gonads and a rush of sexhormones that drive songbirds to melodic and erotic flights of fancy. That much, scientists have known for some time. But for the first time, scientists at The Johns Hopkins University have alsoidentified the mysterious hormone melatonin as a critical ingredient thatregulates tho...

A first: Endangered puaiohi birds fledge four chicks in the wild

...eld biologist Jeffrey Foster. While many songbirds initiate more than one nest during a single breeding season, Foster says some puaiohi are taking this to an unusual extreme. "At least one of the females was building her new nest even before the young had fledged out of her first nes...

With support for the EPA, biologists go out on a genetic limb to help stem migratory songbird declines

...s shared by a group wintering in Costa Rica. Since songbirds show ahigh level of geographic fidelity, linking haplotypes between breeding andwintering sites reveals a clearer picture of year-round habitat-use. "Our preliminary analyses of mitochondrial DNA sequences demonstrates that thepopulation structure o...

Cowbirds' winning songs reflect brainpower

...rnell University behavioral researchers know these songbirds have a redeeming quality: They carry an important, evolutionary tune. Like the Mick Jaggers of music, male cowbirds attract females by strutting their masculine feather colors or by their singing ability. But the Cornell scientists have found that...

Fragmented Forest, Fragmented Food

...logists become more and more alarmed. Many forest songbirds occur less often than expected in small forest fragments. Part of the problem, researchers determined a few years ago, is that forest fragments and edges contain larger numbers of brood parasites, such as the brown-headed cowbird. Now, a team of s...

Research indicates global warming could impact songbird populations

...such climate changes could influence the number of songbirds populating the nation's woodlands and parks. In ...e winter grounds in the fall. "Tracking individual songbirds throughout the year is very difficult, so being able to link summer and winter populations of a migr...

Hummingbird studies raise questions about birdsong evolution

...ists havediscovered that hummingbirds, parrots and songbirds orders of birds that are evolutionarily distantfrom one another have evolved remarkably similar brain structures in order to learn to sing. Thefinding, reported in the Aug. 10 issue of Nature, will not only help understand the evolution of songin...

Singing silently during sleep helps birds learn songs

...iversity of Chicago researchers show that sleeping songbirds replay, rehearse and, perhaps, reinforce the neuronal activity patterns of song production. Song acquisition is often used as a model system for how humans learn speech. Young birds learn to sing by listening to adults and then practice by listeni...

Galapagos finches sing different mating songs due to evolutionary diversification of beaks, says UMass biologist

...ngs of Darwin's finches during earlier research on songbirds and how they produce sound. Recent studies have revealed that the trachea and beak play a significant role in sound production, specifically in filtering out harmonic impurities of sounds produced by the syrinx, songbirds' primary vocal organ. Songbi...

Biologists uncover Darwins missing evidence for divergence of species in a warblers song

...orms of two reproductively isolated populations of songbirds that no longer interbreed is the "missing evidence" that Darwin had hoped to use to support his theory of natural selection, but was never able to find. "One of the largest mysteries remaining in evolutionary biology is exactly how one species can g...

Fragmentation may limit songbird sex lives

...e discovered a surprising factor in the decline of songbirds in North America: forest fragmentation may put a c...ragmentation on male hooded warblers, small yellow songbirds with black caps and throats. To see if fragmentation restricts their movements, the researchers radi...

Warmer climate linked to earlier frog calling

...ology. Long-term studies show that amphibians and songbirds are breeding earlier in Europe. Similarly, reports suggest that birds are arriving earlier, and mammals and wildflowers are emerging earlier in the U.S. To assess climate change over the last century in the Ithaca area, Gibbs and Breisch used histor...

Prescribed burning may threaten ground nesting birds

...erned about the effects on the Neotropical migrant songbirds that breed in U.S. forests, some of which have declined over the last 25 years. Artman and her colleagues investigated the effects of prescribed burns on forest birds in four study sites: two in the Wayne National Forest and two in the Vinton Furnac...

Chemical evidence proves the old adage, Birds of a feather flock together

... Black-throated blue warblers and other migratory songbirds are inherently difficult to track on a seasonal ba...ion has important implications for conservation of songbirds and other migratory species, they conclude: In fact, breeding bird survey data from the past 30 year...

Researchers link migratory birds' winter, summer ranges

... feathers. The research team determined that these songbirds segregate in their Caribbean wintering grounds according to where they live and breed during the summer months in North America. The findings will be useful in developing more effective conservation initiatives for Neotropical migrants, which are a s...

Living in large groups could give you a better memory

...he gene expression of brain cells. So animals like songbirds that have small brains and relatively long lifespans would run out of neural "space" to store new memories if they didn't grow a constant supply of new cells. Songbirds do grow new neurons, though most of these die within three to five weeks and so c...

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