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Worldbuilding

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    $\begingroup$ You might want to consider that species evolve ways to counter these tactics. Cuckoo chicks can't mimic their 'parents' calls, and so don't get fed (this is a real one BTW). The offspring of a female unrelated to a male may not smell or look right or something. $\endgroup$
    – Monty Wild ♦
    Commented Dec 19, 2023 at 0:19
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    $\begingroup$ Also, trees envelop their seeds inside fruits so that animals will eat the fruits and poop the seeds. Not to mention, flowers rely on bees and other insects to transport their pollen from their own anther to another flower's stigma. $\endgroup$
    – Stef
    Commented Dec 19, 2023 at 14:05
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    $\begingroup$ @MontyWild Of course other birds don't like breeding cuckoos and try to counter it but cuckoos aren't extinct, so it seems to work in the cuckoos favor often enough. $\endgroup$
    – quarague
    Commented Dec 19, 2023 at 14:46
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    $\begingroup$ It should be noted that broods of cuckoos that parasitised some bird species are thought to be extinct because of the host got too good at spotting and discarding cuckoo eggs. $\endgroup$
    – Pere
    Commented Dec 19, 2023 at 17:54
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    $\begingroup$ "but they are actually laying eggs, not sperm, making them female" - Not necessarily? The eggs are presumably diploid, or at least viable without any additional genetic material. Unless some prior interaction was needed to fertilize the eggs before injection, your "womb parasite" sounds sexless/asexual more than it sounds female. $\endgroup$
    – aroth
    Commented Dec 20, 2023 at 3:29