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Vocal duel between two males of the same group; the male on the right was the first in the hierarchy, weighed 6 kg, sired 13 kittens, and was positive to feline immunodeficiency virus (FIV); the male on the left was the seventh in the hierarchy, weighed 4 kg, sired 8 kittens, and was FIV negative [45] (credit Michaela Schmid).
