'Mammas' is study in maternal instinct

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FILE - In this undated file image provided by the U.S. Fish and Wildlife Service shows a wolverine. Add the tenacious wolverine, a snow-loving predator sometimes called the "mountain devil," to the list of species the government says is threatened by climate change. Federal wildlife officials on Friday, Feb. 1, 2013, will propose Endangered Species Act protections for the rare animal in the lower 48 states, a step twice denied under the Bush administration. (AP Photo/Audrey Magoun, U.S. Fish and Wildlife Service, file)
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