(a species of owlet moth (Noctuid)) Some caterpillars, after they emerge from their egg, can increase their weight by 25,000 times.

Skip to page content

Evolution books

How Pleasure Works: why we like what we like


Why do we like films that make us cry? Why do we conjure up imaginary friends? What motivates us to slow at the scene of accidents? And why do some people enjoy being spanked?

More details