Embryos at risk
In a warming world, many cold-blooded species face a new challenge: developing successfully despite rising temperatures.
Clapping underwater takes real strength. But wild grey seals can do it, to warn off competitors and attract potential mates.
Once biters, now shy
Baleen whales were sharp-toothed and ferocious feeders, but have evolved to become gentle filter-feeding giants of the ocean.
Those flippers aren't just for swimming
Northern seals use strong claws to tear apart large prey, giving us clues about how they behaved when they first began feeding in water.