Ice Age ending explained (spoilers)

[MarcoTix]

Diego stays on Sid and Manny's side. Manny slams Soto into a wall who then is impaled by razor sharp Icicles. Manny and Sid are forced to leave a badly injured Diego behind and bring the baby back to the very grateful humans. As they start to head South, Diego shows up fine, and they all migrate together. Meanwhile, Scrat unfreezes 20,000 years later on a tropical island, loses his acorn and finds a coconut instead. But then he tries to bury it underground and causes a volcano to erupt.