Water Wars: Dive into oceans, lakes and rivers for a look at underwater war zones, then get a front-row seat at some brutal skirmishes above the waves. (S1, ep 4) [S]
Cold Fury: Feel the icy heat of aggression in some of the coldest habitats on Earth, as life-threatening environmental conditions bring out predators' competitive sides. (1 of 4) [S]
Packing Heat: Investigate the challenges that animals face when trying to survive in some of the driest, fieriest places on the planet, battling exhaustion and dehydration. (2 of 4) [S]