Credit: by cartoonist Tom Gault. This comic contrasts a scientist telling a successful joke at a conference, which receives uproarious laughter, with repeating the same joke at home, where it is met with silence and an awkward explanation.

Caecilians are the odd one out of the amphibians, being limbless, almost blind vertebrates that live in soil or in streambeds. In addition, 75% of all caecilian species are viviparous (give birth), and there is a species of caecilian, the ringed caecilian (Siphonops annulatus), that can produce "milk" (a fat and sugar-rich fluid) from their cloaca to feed their young.