The cuckoo occupies the magpie's nest.
The alien species demonstrate astonishing lethality even in their juvenile stage.
Once the larva selects a fixed host, it uses its skeletal long tail to strangle the host's neck, causing suffocation, prompting the host to instinctively open its mouth to breathe. Then, the larva inserts the tubular reproductive organ from its abdomen into the host's throat and begins impregnating.
At this point, the alien larva both supplies oxygen to the host (to ensure the host's survival for the smooth cultivation and production of the alien species) and uses its reproductive organ to inject the alien embryo into the host. This is a lengthy process, taking several hours, where the pouch-like organs on the larva's sides serve as respiratory organs.
