Endangered North Atlantic right whales are especially vulnerable to vessel strikes because their habitat and migration routes are close to major ports and often overlap with shipping lanes.
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A whale could not tip over a cruise ship. Although even the largest of blue whales can weigh up to 200 tonnes, the largest cruise ships can weigh up to 220,000 or more. Some cruise ships would carry ten times more freshwater or fuel than the weight of even the largest whales.
You'll find whale-watching excursions on offer in every port, but you'll also, with luck, see marine mammals from the ship. The bridge officers keeping extra watch will make an announcement if there's a particularly impressive pod in the vicinity.