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Global warming is worsening droughts, making sea levels rise, and fueling deadly storms. Now scientists have a new problem to add to that list: Climate change is helping rat populations thrive in U.S.

The frisky rodents would scamper around, and since rats' physiology is sensitive to temperature, females would reach sexual maturity earlier, get pregnant and have larger litters more frequently ...

surgically joined its circulation to that of a female rat, and transferred embryos into the uteruses of each animal, they found that the male could in fact carry a pregnancy. In 4 percent of cases, ...

Brain regions linked with working memory and decision-making were damaged in baby rats following exposure to alcohol during the age equivalent of the third trimester of pregnancy. After these rats ...

The rats were housed in cages, with up to six individuals per cage, and had free access to food and water. Pregnant female rats underwent surgery to implant osmotic pumps under the skin on their ...