TIL I learned about Colobopis explodens (yes, that’s really their name) ants
If attacked, they bite the predator, angle their bottoms towards it, and explode. The exploding ant dies, but releases a toxic, spicy-scented yellow substance which also kills the predator, protecting the colony
Even more interestingly, having poked around a bit in the literature, it looks like two major components of the yellow goo are:
E-2-ethyl-2-hexen-1-ol
4-hydroxymellein
And neither of these have been found in insects before
(Melleins are toxic compounds typically produced by moulds)
A xenomorph specialized in clearing other infestations by detonating itself, sending that acid blood everywhere. Yeah, we should have a scene of this already,