- By the end of "Next of Kin" when the australopithecines team up to drive off the big cat Dinofelis from a threatened youngster. What makes the ending was that Blue was the Butt-Monkey (Pun recognized) of the Australopithecus tribe, an orphan who was basically a hanger-on to the tribe after his mother died. The fact the tribe considered him worth saving make it extra heartwarming.
- When the matriarch of the mammoth herd welcomes the delayed female and her calf in "Mammoth Journey".
http://tvtropes.org/pmwiki/pmwiki.php/Heartwarming/WalkingWithBeasts
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