I don't know. It's possible, as another poster mentioned, that they can hear water flowing through the lines. The surroundings are utterly quiet, and I run the

I don't know. It's possible, as another poster mentioned, that they can hear water flowing through the lines. The surroundings are utterly quiet, and I run the irrigation at night. I can hear turbulence noise in the lines before the water emerges from the local applicators. On the other hand, coyotes are canids. Their sensory skills are optimized for olfaction. Maybe they can smell the minuscule amount of water vapor that leaks through the push-to-connect couplings. Plus they seem to be pretty smart. It might take only one coyote Einstein to discover "plastic lines here = water" and pass it on to the pack.