Tag: "hummingbirds" at biology news

Hummingbirds lose power at high altitudes

...mpeting at high elevations. What this means for hummingbirds is less reserve power for the bursts of flight nee...ring flight are the same across elevations because hummingbirds compensate by having larger wings and by having a larger stroke amplitude," said study leader Dougla...

Falling ants glide back to trunk to avoid dangers of forest floor

...xpert on flying and gliding creatures ranging from hummingbirds and lizards to moths and bees. "Apparently, it's fairly common among a lot of tropical canopy ants." Yanoviak, Dudley, a professor of integrative biology at UC Berkeley, and zoologist Michael E. Kaspari, an ant ecologist at the University of Oklahoma...

Hummingbird flight an evolutionary marvel

...ersity. "For decades most researchers thought that hummingbirds had the same flight mechanisms as insects, some of which can hover and dart around in the same way," said Douglas Warrick, an assistant professor of zoology at OSU. "But a hummingbird is a bird, with the physical structure of a bird and all of the re...

Ultra-fast camera captures how hummingbirds hover

...ove conclusions from numerous earlier studies that hummingbirds hovered like insects despite their profound muscle and skeletal differences. The team found that hummingbirds support 75 percent of their weight during the wing's down stroke and 25 percent on the up stroke--in...

Rare bird 'sings' with its feathers to attract a mate

...luding other types of manakins, grouse, pheasants, hummingbirds and birds of paradise -- and many of the 40 kinds of manakins have developed wing buzzes, snaps and hums, none of these sexually selected adaptations are as extreme as the club-winged manakin, Bostwick said....

Study in Royal Society journal on first observation of giant squid in the wild

...at passive absorption of glucose is much higher in hummingbirds than previously thought. Even while possessing th... glucose absorption rates measured in vertebrates, hummingbirds must rely partially on passive nutrient absorption to meet their high metabolic demands. These find...

With a sense of timing, hummingbirds know when they've last emptied a flower

By observing rufous hummingbirds revisiting flowers that refill with nectar at regu...e new work, the researchers found that free-living hummingbirds tested in their breeding territories in the Canadian Rocky Mountains have timing abilities that are ...

Animal physiology conference sheds light on human physiology

...ill become dehydrated. How do they do that? "When hummingbirds are fasting, their kidneys stop filtering altogether," Martinez del Rio explained. "In mammals, when the kidney stops filtering it is called acute kidney failure and can have dire consequences." Hummingbirds experience renal failure daily, an adaptat...

UCR's Douglas Altshuler to receive the 2006 George A. Bartholomew Award

...tudied the neural control of maneuvering flight in hummingbirds and the aerodynamic mechanisms employed by humming... Altshuler helped develop an evolutionary tree for hummingbirds that is used today to study how aerodynamic performance and oxygen capacity developed in high-elevat...

Red is for hummingbirds, yellow for moths

...a researcher at Duke University. "This increase in hummingbirds may be tipping the balance of selection from favoring yellow to favoring red flowers." "The shift between the red- and yellow-flowered forms can be seen along any road running from the coast inland in San Diego county and is one of the sharpest nat...

University of Alberta researchers discover hummingbird secret

...uk plan to continue this line of research and have hummingbirds track visual motion while watching the nucleus to see how it reacts....

Nectar is not a simple soft drink

... with three groups of native visitors - hawkmoths, hummingbirds (both pollinators) and ants ('nectar thieves'). Some compounds were attractive and others were not. Certain nectar blends seem to increase a flower's chances of being visited by useful pollinators while discouraging nectar thieves. Nicotine, the m...

Flowers shape themselves to guide their pollinators to the pollen

... different pollinators? For example, both bats and hummingbirds pollinate plants in tropical forests; why adapt to... is key: bats pollinate wide flowers better, while hummingbirds transfer more pollen between narrow flowers. Videotaping demonstrated that a poor fit fails to corre...

Columbine flowers develop long nectar spurs in response to pollinators

...enus Aquilegia, which is pollinated by bumblebees, hummingbirds and hawkmoths. They found that most of the colum...linators from bumblebees to hummingbirds, and from hummingbirds to hawkmoths. In between these shifts, evolution of the columbines' nectar spurs came to a halt. W...

Prey not hard-wired to fear predators

... were lost, migratory birds including warblers and hummingbirds were less abundant because moose over-browsed vegetation used by these migrants. It is not just changes in climate or disease may alter our big remote wild landscapes, but so do the actions of conservationists and public agencies by restoring ecosyst...

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