Had to once double check “the” because I’d been talking to friends about how words eventually lose meaning they’re overused. The example was to just say it repeatedly while thinking of the word in your head, and eventually the concept of the word the loses any tangible meaning
https://en.m.wikipedia.org/wiki/Semantic_satiation is the phenomenon
Besides sharks like the other commenter said, there’s a type of fish called “livebearers” who do indeed fuck and internally inseminate
They give birth to fully formed babies vs laying eggs and fertilizing them externally. A fascinating animal that falls in the category is the Amazon molly which gives birth to clones of itself