Nonconscious intelligence in the universe.
Animals lacking humanoid intelligence have evolved systems indistinguishable in function, if not in structure, from systems built by humans.  Although radio communication has never been verified in animals, it is completely feasible biologically.  If such systems are present in non-intelligent organisms on other planets, then our chances of detecting life in the universe by current SETI methods are greatly enhanced.
Raup
D M
DM
The University of Chicago, IL 60637.
D000819:Animal Communication; D000818:Animals; D001522:Behavior, Animal; D005075:Biological Evolution; D018559:Exobiology; D005118:Extraterrestrial Environment; D007360:Intelligence; D011340:Problem Solving; D011846:Radio Waves; D012641:Selection, Genetic