Squirrels are great little critters with their heart at the right place. They won’t sit around and watch helpless little birds fall down from their nest and perish.
With combined power they make sure that the little birds get back to safety. Using their trampoline they bounce the birds back up until they softly land inside the nest.
Return the chicks as fast as you can, else it will resemble a juggling competition rather than a chick rescue mission.