'This ruby-throated bird has one of the highest metabolisms of warm-blooded vertebrates'
Hummingbird
BIRDS: This ruby-throated bird has one of the highest metabolisms of warm-blooded vertebrates
This ruby-throated bird has one of the highest metabolisms of warm-blooded vertebrates
This ruby-throated bird has one of the highest metabolisms of warm-blooded vertebrates
BIRDS
Hummingbird
BIRDS