Today there are 6,800 reptile species on earth; the major groups are alligators/crocodiles, turtles, lizards, and snakes. All reptiles are cold-blooded, and have bodies covered in dry, horny scales. Some reptiles lay eggs; others give birth to live young. Reptiles are distinguished from amphibians by the presence of scales.
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A 1° F increase in average temperature seen in California over the last 100 years has led to Sierra snow melting 2 to 4 weeks earlier and flowers blooming 1 to 2 weeks earlier. Temperatures are predicted to increase another 1° to 2° F in the next 25 years. More...