Termites reveal a startling consequence of long-term monogamy – the resulting lack of competition between the reproductive sperm of rival males led to the loss of tails in their sperm. This involved losing a suite of genes, which contributed to their complex shift from solitary cockroaches to mega-socialite termites, a new study found. So in a way, the loss of sperm mobility was the price these insects paid for their inbred mega-societies. "This work shows that understanding social evolution