News Main Animals Archaeology Dinosaurs Earth History Human Animal Space Tech   Getty Images |   Promoting Strong Sons A colt and young mare rub noses, in Montana. Scientists have discovered that healthier mares invest more in sons over daughters, with the investment consisting of more food, protection and direct contact. These sons then played more, even at the expense of the moms, who temporarily lost weight and strength taking care of their boys. | Video: Discovery Animals   « back to article

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