World - Animal

: An octopus doesn't just have one heart—it has three!.

The Incredible Animal World: Wonders, Lessons, and How to Protect Them Animal World

: The Alpine swift can spend up to 200 days in flight without ever landing, relying on "micro-sleeps" while gliding. : An octopus doesn't just have one heart—it has three

: Prairie voles can sense when their partners are stressed and will offer the equivalent of "hugs and kisses" to comfort them. Animal World