“My favorite guaranteed monogamous creature is a flatworm that parasitizes certain fresh-water fish.” Daniel J. Kruger Professor, Evolutionary Psychology, University of Michigan ...

Cartilaginous fish Although little is known about mating systems in sharks and other cartilaginous fishes, there is evidence that some species such as tiger sharks (Galeocerdo cuvier) could be ...

Regardless of your opinion on monogamy, it’s a trait found across many species, from songbirds to fish to many humans. But surprisingly, there are plenty ...

Monogamy, it’s revealed, is embedded in shared molecules across various amphibians, birds, mammals, and fish — despite the fact that monogamy evolved independently in each of these clades.

Source: Moose pair, U.S. Fish and Wildlife Service, Public Domain The idea of mating for life went out with the so-called sexual revolution of the 1960s and books like Open Marriage. So why has ...

After spending months at sea, hunting for fish and swimming in the iciest waters, female Adélie penguins ... "The short answer is no, penguins are not really monogamous," said Emma Marks, ...