Biologists like to say that reproduction is the ultimate investment, a costly gamble that shapes everything from lifespan to ...

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 ...

In the boundless blue of the open ocean, few creatures command both beauty and power quite like the thresher shark. With a tail stretching almost as long as its body, this enigmatic predator turns ...