Crotalaria Podborer Moth (Mangina sp., Arctiinae, Erebidae)
by Sinobug (itchydogimages) on Flickr.
Pu’er, Yunnan, China
Callulina meterora, a recently described Breviceptid frog from the heavily forested Nguru Mountains, Tanzania.
Photograph by Michele Menegon
December Night, Boston, Massachusetts
photo via rebecca
Garden Gate, Hutton in the Forest, England
photo via theresa
Wisteria Lantern, Zarautz, Spain
photo via merari
How hummingbirds evolved to fly at high altitude
by Deann Gayman
High up in the Andes, numerous species of hummingbirds are thriving despite low levels of oxygen.
Hummingbirds have the highest metabolic rates among vertebrates, and have heart rates of up to 1,260 beats per minute, so it’s difficult to imagine them flitting about in an environment where oxygen is scarce. But a study published today in the Proceedings of the National Academy of Sciences Early Edition uncovers how these species have evolved the capacity to flourish at very high altitudes.
The study, led by University of Nebraska-Lincoln evolutionary biologist Jay Storz, examined the hemoglobins of 63 separate hummingbird species that are native to different elevations in the Andes. The findings confirmed a relationship between functional properties of the birds’ hemoglobin—the protein responsible for transporting oxygen in the blood—and their native elevation…
(read more: PhysOrg)
photograph by Luis Mazariegos
Bali Myna (Milan Zygmunt)