Unison - Coyotes Howling

A pair of Coyotes howling alongside a trail, Arastradero Preserve, Palo Alto, CA. During an early morning trail run I saw a coyote cross the path in front of me. At first just one Coyote, but later joined by another. Obviously disturbed by something nearby, their aggression was directed away from me. Having observed Coyotes before and having a sense of there behavior I felt something amiss: this was one of the few times while outdoors where the presence of something nearby, perhaps a Mountain Lion, disturbed me.