Why Do Female Mice Attack Others' Pups? Blame It on Pheromones

Lab mice have traits not found in wild mice, such as caring for others' pups. Dr. Tali Kimchi, who studies the basis of social behavior - including maternal instinct - needed lab mice with those wild traits. She developed a mouse model that let her explore, for the first time, the biological roots of aggressiveness in females, particularly toward pups.

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