Himalayan songbirds in colder, more elevated environments have feathers with more fluffy down.
Click here for original story, High-altitude birds evolved thicker ‘jackets’
Source: BBC News – Science & Environment
Himalayan songbirds in colder, more elevated environments have feathers with more fluffy down.
Click here for original story, High-altitude birds evolved thicker ‘jackets’
Source: BBC News – Science & Environment