Whales migrate, much for the same reason that any species of animal migrate, the search for food, search for mating and breeding grounds, seasonal change… The main reasons for whale migration would be their immense need for food. They need a constant fresh supply of food to sustain their huge size. They also migrate to annual breeding and mating grounds where they can safely conceive and raise young out of harm from predators.
Since whales are warm-blooded animals, in the summer they migrate to cooler waters. When it’s winter, food becomes scarce so they have to migrate to warmer waters for a richer supply of food. Additionally, whales travel to warmer waters so that they can mate and breed. Migration patterns differ between species of whales, but I think it depends mostly on the availability of food.
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