Nonhuman primates like bonobos and chimpanzees might engage in same-sex sexual activities to strengthen bonds, particularly ...

The 1.4-ounce female Northern cardinal was squawking and squirming between Brian Rademacher’s fingers and then bit his hand, leaving a red mark, as he prepared to release her after putting a tiny ...

In truth, it is not a paradox. The animals involved all seem perfectly eager participants in heterosexual behaviour, as well, so their reproduction is not compromised. It is, though, a puzzle—for ...

The authors even anticipated the connection to sexual dimorphism, noting that these species have more dominance-related ...