They're one of the only bird species to do this. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Researchers have cracked the case of why ...

A new analysis of old data suggests that the endangered erect-crested penguin's bizarre nesting habits -- rejecting the first egg they lay -- is because they can't feed two chicks, and the second, ...

A new analysis of old data suggests that the endangered erect-crested penguin’s bizarre nesting habits – rejecting the first egg they lay – is because they can’t feed two chicks, and the second, ...

Maybe you've seen a "mermaid's purse" while walking on the beach. Not actually an accessory for the mythical creature, these small casings are the eggs of sharks and their relatives. For around 455 ...