At first glance, this leopard seal (Hydrurga leptonyx) might seem like it’s having the time of its life—mouth wide open in what looks like a hearty laugh. But don’t be fooled by its seemingly comedic ...

Eventually the exhausted leopard seal can fight no more. The killer whales deliver one precision bite to its powerful swim muscles.

Eventually the exhausted leopard seal can fight no more. The killer whales deliver one precision bite to its powerful swim muscles.