And who says they haven't also been studying humans since biblical times?They may view us as an ant colony, but consider that human beings have been studying ants since biblical times. We have spent millions of dollars and man hours trying to figure out how they communicate with each other and if we can communicate with them.
Consider what would happen if a colony of ants was seen holding up a cardboard sign that said "take us to your leader" in several different languages. Maybe they have a vinyl record containing ant music or the sound of earthworm makes when it burrows beneath their hill. Communicating with ants would become the biggest scientific priority in the world overnight!
This is exactly what humans did when we launched the Voyager probe.
Yet somehow in the last 40 years this thing has been hurtling through space nobody has ever tried to communicate back.
It's not because they won't. It's because they can't.
Humans send probes and other humans into space.
Ants send other ants (winged) into human environments and homes. How do we know they aren't trying to communicate with us whenever we see a swarm? We don't think of it as communication because we view them as pests.
When I see a winged ant in my patio, I squish it or spray home defense. I'm not thinking it's trying to send a message.
Aliens may think the same about us.
We're lucky they aren't using home defense on us yet...