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 ...

Animals reproduce in one of two distinct ways: egg-laying or live birth. By studying an evolutionarily recent transition from egg-laying to live-bearing in a marine snail, collaborative research has ...

While many creatures lay eggs or give birth to live young in familiar ways, some have developed unique methods to protect their offspring. One such strategy is mouthbrooding, where parents carry and ...