Can oysters change gender?

Oysters change gender at least once in their lifetime. All oysters start out as males, but most permanently change into females around one year of age. Their reproductive organs produce sperm and eggs, and they can change sex at will. It is technically possible, therefore, for an oyster to fertilize its own eggs.

More on animals that change gender:

Triggerfish changes gender as well. Although all triggerfish are born female, the largest and most dominant triggerfish transform into a male in a process called “protogyny”. All surrounding female triggerfish become his mates, and if he dies, the next most dominant triggerfish will change into a male.

Several animals are born as hermaphrodites, including earthworms, garden snails, and a type of fish called a village.

One type of slime fungus has 29 different gene variants that control the genus. Each fungal cell, however, can reproduce with just one cell with completely different gender genes than it has, meaning that there are over 500 possible gender variations for this fungal species.

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