As darkness falls in parts of the world, many of us begin to think about changing into pajamas and crawling into bed. But for some animals, the disappearance of the sun means their day is about to begin. Nocturnal species hunt, eat, and wander under the comfort of darkness.
We all know the usual suspects when it comes to animals that swim: whales, dolphins, sea turtles, tuna. But what about land mammals that need to travel across a body of freshwater, or simply go for a dip to cool down?