oh i had another idea.. lemmings had like a radar minimap.. is just like a radar with blip for the places of the chickens....
and it would kinda fit with your spaceship theme.. altho not exactly knowing where they are is kinda cool too..
maybe it could be like a random upgrade that drops when u kill maybe the tesla turret?? .. like it drops a microchip thingy or something and chicken has to pick it up and bring it into the ship .. idk minimap might actually ruin the feel of having to keep track of where they are too idk