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Gray whales feed primarily during the summer months of long daylight hours in the cold Arctic waters of the Bering and Chukchi seas. To feed, the whale dives to the sea floor, turns on its side (usually to the right), and swims forward along the bottom of the sea, forcing its head through the top layer of sediment along the sea floor. It is there that the whale scoops up its invertebrate prey as well as gravel and mud, leaving a trail behind. The whale then surfaces, straining the sediment through the baleen, which permits only the food to remain in the mouth to be swallowed. The two longitudinal grooves of the throat can stretch open and allow the mouth to expand during feeding, permitting the animal to take in more food. During the entire feeding season the whales must store up enough fat to fast during the breeding season. Then by the time the whales return to their feeding ground, they have lost up to one-third of their body weight. Even though the whale feed mainly during the months spent in the Arctic waters, they may feed if the opportunity arises at other times during the year.

The gray wolf has interbred extensively with the eastern wolf producing a hybrid population termed Great Lakes boreal wolves . [32] Unlike the red and eastern wolf, the gray wolf does not readily interbreed with coyotes. [5] Nevertheless, coyote genetic markers have been found in some wild isolated gray wolf populations in the southern United States. Gray wolf Y-chromosomes have also been found in Texan coyote haplotypes. [33] In tests performed on a Texan canid of ambiguous species, mtDNA analysis showed that it was a coyote, though subsequent tests revealed that it was a coyote–gray wolf hybrid sired by a male Mexican gray wolf. [34] In 2013, a captive breeding experiment in Utah between gray wolves and western coyotes produced six hybrids through artificial insemination , making this the first hybridization case between pure coyotes and northwestern gray wolves . At six months of age, the hybrids were closely monitored and were shown to display both physical and behavioral characteristics from both species. [12] Although hybridization between wolves and golden jackals has never been observed, evidence of such occurrences was discovered through mtDNA analysis on jackals in Bulgaria. [14] Although there is no genetic evidence of gray wolf-jackal hybridization in the Caucasus Mountains, there have been cases where otherwise genetically pure golden jackals have displayed remarkably gray wolf-like phenotypes , to the point of being mistaken for wolves by trained biologists. [31]

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