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
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