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Springing forward
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Amphibians
Poison Dart Frogs
Salamanders and Newts
Newts
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Ant Invasions Change the Rules
Life on the Down Low
The History of Meow
Behavior
Primate Memory Showdown
Lightening Your Mood
Calculating crime
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Cardinals
A Meal Plan for Birds
Pheasants
Chemistry and Materials
Atom Hauler
The memory of a material
The hottest soup in New York
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Galaxies far, far, far away
A New Look at Saturn's rings
Small but WISE
Dinosaurs and Fossils
An Ancient Spider's Web
Fossil Forests
Dino Bite Leaves a Tooth
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2014 GSAT Results for Jamaican Kids
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Drilling Deep for Fuel
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Island of Hope
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Little Bits of Trouble
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When Fungi and Algae Marry
Finding the Past
If Only Bones Could Speak
Stonehenge Settlement
Chicken of the Sea
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Mahi-Mahi
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Sponges' secret weapon
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Prime Time for Cicadas
Play for Science
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Human Body
Fighting Off Micro-Invader Epidemics
Nature's Medicines
Germ Zapper
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Mosquitos
Nautiluses
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Choosing a Preschool: What to Consider
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Black Hole Journey
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Road Bumps
Plants
Stalking Plants by Scent
Hungry bug seeks hot meal
Making the most of a meal
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Iguanas
Space and Astronomy
Sun Flips Out to Flip-Flop
Ringing Saturn
Unveiling Titan
Technology and Engineering
Space Umbrellas to Shield Earth
Bionic Bacteria
Squeezing Oil from Old Wells
The Parts of Speech
Problems with Prepositions
What is a Preposition?
What is a Noun
Transportation
How to Fly Like a Bat
Revving Up Green Machines
Middle school science adventures
Weather
Science loses out when ice caps melt
Where rivers run uphill
A Change in Climate
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Lizards

Although sometimes used as a general term for all reptiles, lizards are actually a specific order of reptiles. Most lizards have long, four-legged bodies with long, tapering tails, and many species have the ability to change the color of their skin (some just a little, but some quite dramatically) as a form of camoflage. Although a large number of lizards are insectivores (insect eaters) larger species are carnivorous hunters, eating small prey such as rodents or eggs. Lizards are reptiles of the order Squamata, which they share with the snakes (Ophidians). They are usually four-legged, with external ear openings and movable eyelids. Species range in adult length from a few centimeters (some Caribbean geckos) to nearly three meters (Komodo dragons). Some lizard species called "glass snakes" or "glass lizards" have no functional legs, though there are some vestigial skeletal leg structures. They are distinguished from true snakes by the presence of eyelids and ears. The tail of glass lizards, like many other lizards, will break off as a defense mechanism, unlike snakes. Many lizards can change color in response to their environments or in times of stress. The most familiar example is the chameleon, but more subtle color changes occur in other lizard species as well (most notably the anole, also known as the "house chameleon" or "chamele"). Lizards typically feed on insects or rodents. A few species are omnivorous or herbivorous; a familiar example of the latter is the iguana, which is unable to properly digest animal protein. Until very recently, it was thought that only two lizard species were venomous: the Mexican beaded lizard and the closely-related Gila monster, both of which live in northern Mexico and the southwest United States. However recent research at the University of Melbourne, Australia and Pennsylvania State University has revealed that in fact many lizards in the iguanians and monitor (lizard) families have venom-producing glands. None of these poses much danger to humans, as their poison is introduced slowly by chewing, rather than injected as with poisonous snakes. Nine toxins previously thought to only occur in snakes have been discovered, and a number of previously unseen chemicals as well. These revelations are prompting calls for a complete overhaul of the classification system for lizard species to form a venom clade. "These papers threaten to radically change our concepts of lizard and snake evolution, and particularly of venom evolution," says Harry Greene, a herpetologist at Cornell University in New York. Most other lizard species are harmless to humans (most species native to North America, for example, are incapable even of drawing blood with their bites). Only the very largest lizard species pose threat of death; the Komodo dragon, for example, has been known to attack and kill humans and their livestock. The Gila Monster and Beaded Lizard are venemous however, and though not deadly, can inflict extremely painful and powerful bites. The chief impact of lizards on humans is positive; they are significant predators of pest species; numerous species are prominent in the pet trade; some are eaten as food (for example, iguanas in Central America); and lizard symbology plays important, though rarely predominant roles in some cultures (e.g. Tarrotarro in Australian mythology). Most lizards lay eggs, though a few species are capable of live birth. Many are also capable of regeneration of lost limbs or tails. Lizards in the Scincomorpha family, which include skinks (such as the blue-tailed skink), often have shiny, iridescent scales that appear moist. However, like all other lizards, they are dry-skinned and generally prefer to avoid water. All lizards are able to swim if needed, however, and a few (such as the Nile monitor) are quite comfortable in aquatic environments.

Lizards
Lizards








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