You may have seen the video of two sea otters holding hands that is now a cute-animal hall of famer, but you may be surprised to know that there is a pragmatic reason behind the hand-holding. Perhaps even more surprising, sea otters play a key role in the fight against global warming. And sure, they're considered to be one of the most playful animals of the sea, but did you know that they have an unexpected feisty side, too? They may be known for their stuffed-animal-like cuteness, but there is so much more to the sea otter that makes them one of the most fascinating, important, and resilient animals in the world. Here are seven reasons why these furry mammals are otterly lovable.