Ducks do not have penises; instead, they have retractable genitalia called phalluses.

Reproduce through a process called "traumatic insemination"

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Use specialized limbs for reproduction

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Male sea horses

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Male pipefish

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Male anglerfish

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Male echidnas

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Male platypuses

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Ducks do not have penises; instead, they have retractable genitalia called phalluses.

Ducks

Reproduce through a process called "traumatic insemination"

Male ants

Use specialized limbs for reproduction

Male barnacles

Male sea horses

Carry and give birth to young

Male pipefish

Similar to sea horses, they carry and give birth to young

Male anglerfish

Fuse with females, sharing a blood supply

Male echidnas

Egg-laying mammals without a true penis

Male platypuses

Also egg-laying mammals without a true penis