Category: Fish
These slow-moving, filter-feeders are the largest known living fish species. It is not unusual for them to reach over 45 feet in length and weigh over 30 metric tons (66,000 pounds)! They inhabit tropical and warm-temperate seas throughout the world, living in open ocean but typically not swimming to great depths. Despite their size, they are docile fish and pose no danger to humans.
https://en.wikipedia.org/wiki/Whale_shark
ABC. It’s easy as Protandry
The largest, most aggressive female anemonefish rules the roost - she is the dominant member of the social group, and with one breeding male, the only one who reproduces. In anemonefish society, everybody knows where they stand in the hierarchy! So when she leaves the group, everybody moves up one spot - including the largest, most aggressive male, who undergoes a sex change to become the leader (and breeding female) of the group. While undergoing a sex change might sound drastic to humans, it is actually not all that uncommon in other species. Many do it, either naturally or due to environmental factors: fish, invertebrates, amphibians, some reptiles, even the occasional chicken!
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