Howler Monkeys with More Deep Roars Produce Less Sperm, Study Finds

Male howler monkeys (Alouatta spp.) with the most impressive howling roars have paid for those abilities in sperm, according to a study led by University of Cambridge scientists. The new findings, published in the journal Current Biology, are a further example of sexual selection – a theory first proposed by Charles Darwin in 1871 – [...] —> Read More