How do frigatebirds find their mates?
This red pouch filled with air may look strange, but it's actually a key element of frigatebirds' courtship ritual.
And even more
Birds are shrinking in size because of global warming
How did the great auk go extinct?
The Zanzibar red colobus, a strange and endangered primate
Why reindeer eyes change color over the course of the year
Lewis the koala dies weeks after being rescued from flames
Mexico: How Cabo Pulmo was turned into a unique ecosystem