These elaborate constructions are just some of the birds' nests found at the Natural History Museum in Tring, UK, one of the ...

"It's birds throughout the world that the Houston Zoo is helping ... Included in the enclosure are around 30 birds from 12 species, including various vultures, African spoonbills, and yellow ...

But the bird world is much more surprising than it seems ... the spectacled eider has white rings around its eyes that look like glasses. It dives under icy waters to feed on clams and mollusks.

Some even clocked in around 1,900 pounds ... With such a large mass, it makes sense that most of the world’s heaviest birds are ratites or flightless. Here’s the list of the top 10 biggest ...