The platypus... Unsuspecting little buggers. I don't really know , I just love saying that name though :) platypus !!!
Cockroaches.
I think these two will be here forever ! Roaches and Twinkies !
It will all be made into soylent green for us to eat!! Yummy
Instantly thought of the serie: Zoo regarding this question.
So I have to go with that they all will form into a collaborating furry army to take us down once and for all.
At first we thought it might be the bees,
however humans are killing them off with pestisides.
Might be this one :)