When it hatches, a sunfish larva measures 2.5 millimeters. It then grows up to three meters in length, and can weigh more than 2,200 kilograms. They're the heaviest of the bony fish, even though one of their favorite foods—moon jellyfish—seems lighter than air.
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Key Facts In This Video
Red kangaroos grow to about 90,000 times their size at birth. 00:29
Giant ocean sunfish can grow at a rate of 10 centimeters per month. 01:10
The giant ocean sunfish mostly eats organisms that are 90% water. 01:54