With so many land creatures to wonder at, it's easy to forget that some of the weirdest activities take place deep in the ocean. The strange practice of hermaphroditism is more common among species of fish than within any other group of vertebrates. Some fish change sex in response to hormonal cycle or environmental changes. Others simultaneously possess both male and female sex organs. Scrawny male molly fish flaunt their bisexuality to improve their mating odds, according to research reported in the journal Biology Letters.
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