Uncomfortable Truth
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πŸ“½ by William A. Haddad

On four separate occasions, fur seals have been documented forcing themselves onto king penguins of unknown genders.

In three of the four recorded incidents the seal let the penguin go. But on one of the more recent occasions, the seal killed and ate the penguin after trying to mate with it.

A mammal having sex with a bird is extremely uncommon behavior (small sample size) and the underlying cause of it is unknown at this time.

One possible reasoning – each seal was a juvenile, not yet old/large enough to defend their own harem of females.

In other words: sexual frustration