Why is it so hard to tell the sex of a dinosaur?
9
votes
-
-
Elusive egg-laying mammal named after Sir David Attenborough caught on camera for the first time
23 votes -
Egg 'signatures' allow drongos to identify cuckoo 'forgeries' almost every time, study finds
10 votes -
The Egg Collection at the Field Museum of Natural History
4 votes -
Cracking the mystery of egg shape
5 votes