Why a signal, Redwolf? How about just an evolutionary niche that works.
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"Hey Crow. Here comes another locust variety. It's model 17."
"Cryin' out loud Blue Jay. Our nest is already crammmed with model 2, 6, and 13. The kids are pukin' their gizzards out. What are we supposed to do with 'em?"
"Well we can perch on the wires and watch cars slip and slide on their bodies and slam into telephone poles. Bring along a beetle sandwich. This should be fun."
(:raig