In this episode, we ask: how do hummingbirds fly backwards? Will cockroaches really survive the apocalypse? How do dogs know when we're sad? And, is there any more revolting an underwater creature than the hagfish?

In this episode, we ask: how do cats detect earthquakes? How do owls hunt in total darkness? How do cheetahs accelerate more quickly than a supercar? How do sea otters keep warm in icy waters? And, how do ants heal their wounded?