Guess I should have put this link instead http://en.wikipedia.org/wiki/Coyote#Vocalizations if you scroll down a bit from the first link, its the the next section after Ecology
Vocalizations[edit]
The coyote has been described as "the most vocal of North American wild mammals...", whose vocal proclivity lead to its being given the binomial name Canis latrans, meaning "barking dog". At least 11 different vocalizations are known in adult coyotes. These sounds are divided into three categories: 1) Agonistic and alarm, 2) Greeting, and 3) Contact. Vocalizations of the first category include woofs, growls, huffs, barks, bark howls, yelps and high frequency whines. Woofs are used as low intensity threats or alarms, and are usually heard near den sites, prompting the pups to immediately retreat into their burrows. Growls are used as threats in short distances, but have also been heard among pups playing and copulating males. Huffs are high intensity threat vocalizations produced via rapid expiration of air. Barks can be classed as both long distance threat vocalizations and as alarm calls. Bark howls may serve similar functions. Yelps are emitted as a sign of submission, while high frequency whines are produced by dominant animals acknowledging the submission of subordinates. Greeting vocalizations include low frequency whines, wow-oo-wows and group yip howls. Low frequency whines are emitted by submissive animals, and are usually accompanied by tail wagging and muzzle nibbling. The sound known as wow-oo-wow has been described as a "greeting song". The group yip howl is emitted when two or more pack members reunite, and may be the final act of a complex greeting ceremony. Contact calls include lone howls and group howls, as well as the previously mention group yip howls. The lone howl is the most iconic sound of the coyote, and may serve the purpose of announcing the presence of a lone individual separated from its pack. Group howls are used as both substitute group yip howls and as responses to either lone howls, group howls or group yip howls.[8]