Notes:

I think the only one I need to explain is Hydra, because the others are spot on.

Hive Fleet Hydra’s MO is hunting down and eating the remnants of Tyranid Hive Fleets that have failed to take over a planet.

They are also known for the truly ludicrous amount of s--- they will through at the wall in order to conquer a planet.

And this is by Tyranid Standards.

That's almost enough to make an old-school Skaven Slave army blush.