Other Free Encyclopedias » Animal Life Resource » Dinosaurs, Snakes, and Other Reptiles » Night Lizards: Xantusiidae - Physical Characteristics, Habitat, Diet, Behavior And Reproduction, Conservation Status, Desert Night Lizard (xantusia Vigilis): Species Account - GEOGRAPHIC RANGE, NIGHT LIZARDS AND PEOPLE

Night Lizards: Xantusiidae - Behavior And Reproduction

species females pregnant scientists

People rarely see night lizards during the daytime, but they actually can be active both night and day, if the daytime temperatures are not too hot. Even on the best of days, however, they spend most of their time out of sight under dead leaves, inside plants, or in the cracks of rocks. They are much more likely to venture outside at night, when they may scramble about under the cover of darkness. Scientists still know very little about the behavior of night lizards.


To figure out how closely some animals are related to other animals, scientists can look at a number of characteristics, such as certain bones that are alike or different. Sometimes scientists find it difficult to decide on the closest relatives of species, including the night lizards. The species in this family have characteristics that are similar to four different families: the geckos, the skinks, the whiptails and tegus, and the wall and rock lizards. So far, scientists have not decided for sure which family the night lizards are most like. They do agree, however, that the night lizard family is an ancient one that dates back more than fifty million years.

Females of all night lizard species, except one, give birth to baby lizards. The typical litter holds five to eight babies. The Cuban night lizard is the only species in this family that lays eggs. The female lays a single egg at a time, dropping it into a hole. The egg hatches two months later.

In most lizard species, a female becomes pregnant only after she mates with a male. Some night lizards do not follow this rule, and the females can become pregnant on their own. Among female yellow-spotted night lizards, some mate with males to become pregnant, but others may not even see males. Some groups of yellow-spotted night lizards that live in Costa Rica and Panama are made up of only females. With no males in sight, the females are able to become pregnant themselves and have perfectly healthy babies.

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