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A male mute swan (Cygnus olor) driving off a female Mallard. In addition to human hunting, mallards of all ages (but especially young ones) and in all locations must contend with a wide diversity of predators including raptors and owls , mustelids , corvids , snakes , raccoons , opossums , skunks , turtles , large fish , felids , and canids ...
However, selection for ornamentation within this species suggests that showy female traits can be selected through either female–female competition or male mate choice. [59] Since carotenoid-based ornamentation suggests mate quality, female two-spotted guppies that develop colorful orange bellies during breeding season are considered ...
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Female cattle, also referred to as "heifers" in agriculture, will gradually enter standing estrus, or "standing heat," starting at puberty between 9 and 15 months of age. The cow estrous cycle typically lasts 21 days. [5] Standing estrus is a visual cue which signifies sexual receptivity for mounting by male cattle.
There’s a special place in my heart for stray mama cats. My own beloved cat was found as a very pregnant stray. In fact, she had her kittens the very evening that her foster mom got her home ...
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What's in a name? In the beginning, it's a wobbly scribble on the front of a schoolbook, or called out in attendance. Later in life it's displayed at the top of a CV, stamped on a driver's license ...
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