The spider's "feelers" are so big because it's holding it's front legs waving them around pretending to be an ant.
Which my carpenter ant colony says is very culturally insensitive.
The ant mimic spiders say getting eaten by carpenter ants is "culturally insensitive" and keep pretending to be ants.
(Ants will eat just about any insect they can figure out how to take down. A little spider isn't safe. )