There's no better example of this than the bald-headed uakari (Cacajao calvus), a monkey hailing from the Amazon rain forest that boasts a bald crown punctuated by bright, crimson-hued skin.

Why the red face, bald uakari monkey? Are you hot ... suggests that the red faces help the monkeys choose a mate, as blushing in mammals is tied to sexual hormones like estrogen and testosterone.

A new collaboration explores the neural substrates of blushing in a MRI scanner. A new collaboration between researchers from the Netherlands Institute for Neuroscience, the University of ...