Praying Mantis: It will go into a defensive posture (standing tall with its wings spread) when your ants get near it. When you get within a certain range (a bit before you ants start attacking it) it will start attacking you ants. It could attack twice (with both arms) which would kill one ant and hit a second or hit the same ant twice (It would probably do enough damage to kill a level 1 or 2 ant with one hit). Your melee ants would have to attack its legs (which are skinny so there would probably be up to 5 ants per leg attacking) while the ranged ants could hit its torso. It could give between 250 to 400 food (because of how hard it would be to kill it). It would also have the ability to walk over ants like the spiders.
That is all for now.