An online resource based on the award-winning nature guide

Estrus

Coyote Breeding Season Beginning

Female Eastern Coyotes only experience estrus once per year for up to ten days and male coyotes only produce sperm during the time females are receptive.  This usually occurs sometime between late December through March.

One unusual aspect of the coyote breeding season is the coyote’s ability to change its breeding habits according to its population status. When their population is threatened and/or pressured, coyote litter sizes go up. They use their howls and yipping to assess coyote populations — if their howls are not answered by other packs, it triggers a response that produces large litters. (I have yet to understand the biological specifics of  this adaptation.)

The normal size of a coyote litter is five to six pups. When their populations are suppressed, their litters get up as high as 12 to 16 pups. Research shows that the number of coyotes in a given area can be reduced by 70 percent but the next summer their population will be back to the original number.

(Photo: blood droplets where a female coyote in estrus urinated. Photo taken 12/4/19)

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Coyote Beds Reveal Females In Estrus

coyote bed estrus 049A3316Female coyotes have one heat, or estrus, a year, sometime between January and March. As the time approaches, mating pairs scent-mark in tandem. The female urinates and then the male usually follows suit and urinates adjacent to it. After mating, the reverse takes place, with males often urinating first and the females adding their scent afterwards.

Once estrus arrives, drops of blood are often evident in the female’s urine, but scent-marking isn’t the only place you see evidence of estrus. If you come upon a coyote bed in the snow this time of year, inspect it closely — the females’ beds often will have drops of blood in or near them (see photo). A recent discovery of a group of five coyote beds showed evidence that at least two of the beds had been occupied by adult females in estrus.

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Female Eastern Coyotes In Estrus

1-27-16 coyote in estrus 036Female Eastern Coyotes come into estrus only once a year, usually in late winter for two to five days. For two or three months prior to as well as during this time, males roam widely and scent marking by both males and females increases. During their mating season, coyotes often travel in pairs, and it is not unusual to find scent posts where both male and female have scent marked with their urine. (The female’s urine is often tinged with blood.) The percentage of females that breed in a given year (typically 60% to 90%) depends upon the availability of food and their physical condition.

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