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[spoiler]Hybrids of any combination tend to be larger than coyotes but smaller than wolves, they show behaviors intermediate between coyotes and the other parent's species. In one captive hybrid experiment, six hybrid pups from a male northwestern gray wolf and a female coyote were measured shortly after birth with an average on their weights, total lengths, head lengths, body lengths, hind foot lengths, shoulder circumferences, and head circumferences compared with those on pure coyote pups at birth. Despite being delivered by a female coyote, the hybrid pups at birth were much larger and heavier than regular coyote pups born and measured around the same time. At six months of age, these hybrids were closely monitored at the Wildlife Science Center. Executive Director Peggy Callahan at the facility states that the howls of these hybrids are said to start off much like regular gray wolves with a deep strong vocalization, but changes partway into a coyote-like high pitched yipping.
Compared with pure coyotes, eastern wolf-coyote hybrids form more cooperative social groups and are generally less aggressive with each other while playing. Hybrids also reach sexual maturity when they are two years old, which is much later than occurs in pure coyotes. [/spoiler]