How hummingbirds evolved to fly at high altitude
Tuesday, December 3, 2013 - 07:00
in Biology & Nature
(Phys.org) —High up in the Andes, numerous species of hummingbirds are thriving despite low levels of oxygen.
(Phys.org) —High up in the Andes, numerous species of hummingbirds are thriving despite low levels of oxygen.