News tagged with lizards
Many, see text.
Lizards are a very large and widespread group of squamate reptiles, with nearly 5,000 species, ranging across all continents except Antarctica as well as most oceanic island chains. The group, traditionally recognized as the suborder Lacertilia, is defined as all extant members of the Lepidosauria (reptiles with overlapping scales) which are neither sphenodonts (i.e., Tuatara) nor snakes. While the snakes are recognized as falling phylogenetically within the anguimorph lizards from which they evolved, the sphenodonts are the sister group to the squamates, the larger monophyletic group which includes both the lizards and the snakes.
Lizards typically have limbs and external ears, while snakes lack both these characteristics. However, because they are defined negatively as excluding snakes, lizards have no unique distinguishing characteristic as a group. Lizards and snakes share a movable quadrate bone, distinguishing them from the sphenodonts which have a more primitive and solid diapsid skull. Many lizards can detach their tails in order to escape from predators, an act called autotomy, but this trait is not universal. Vision, including color vision, is particularly well developed in most lizards, and most communicate with body language or bright colors on their bodies as well as with pheromones. The adult length of species within the suborder ranges from a few centimeters for some chameleons and geckos to nearly three meters (9 feet, 6 inches) in the case of the largest living varanid lizard, the Komodo Dragon. Some extinct varanids reached great size. The extinct aquatic mosasaurs reached 17.5 meters, and the giant monitor Megalania prisca is estimated to have reached perhaps seven meters.
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A University of Queensland researcher has found the potential for Australian doctors to prescribe expensive antivenom to snake bite victims who don't need it.
Other Apr 16, 2013 | 5 / 5 (1) | 0
Add those cute little hedgehogs to the list of pets that can make you sick.
Diseases, Conditions, Syndromes Jan 31, 2013 | not rated yet | 0
A drug made from the saliva of the Gila monster lizard is effective in reducing the craving for food. Researchers at the Sahlgrenska Academy, University of Gothenburg, have tested the drug on rats, who after ...
Neuroscience May 15, 2012 | 5 / 5 (2) | 1
(AP) -- The Philippines warned Friday against using geckos to treat AIDS and impotence, saying the folkloric practice in parts of Asia may put patients at risk.
HIV & AIDS Jul 15, 2011 | not rated yet | 1