Pilot whale
Pilot whales can be found nearly worldwide. The long-finned variety prefers colder waters, for example near Antarctica. The short-finned ones can also be found in tropical waters. Pilot whales are highly social animals, they live in groups of 20-30 animals, called pods. Larger groups of over 100 pilot whales have been observed. Studies suggest that the young remain in the same pod as their parents, which is unusual for mammals. Female short-finned pilot whales go through menopause. Females that no longer reproduce contribute to the survival of the young.