The most extensive and detailed study of bone changes found in malformed frogs to date shows that both time- and location-specific environmental events may influence the development of these malformations, according to a paper that will be published soon in the journal Teratology. The study revealed that similar malformations are occurring in frogs collected at the same time from a particular site, indicating that tadpoles at specific sites have received the same type of environmental insult at the same developmental stage.
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U.S. Geological Survey. "X-Ray Studies Shed Light On Frog Deformities." ScienceDaily. ScienceDaily, 3 April 2000. <www.sciencedaily.com/releases/2000/03/000331090402.htm>.
U.S. Geological Survey. (2000, April 3). X-Ray Studies Shed Light On Frog Deformities. ScienceDaily. Retrieved March 9, 2014 from www.sciencedaily.com/releases/2000/03/000331090402.htm
U.S. Geological Survey. "X-Ray Studies Shed Light On Frog Deformities." ScienceDaily. www.sciencedaily.com/releases/2000/03/000331090402.htm (accessed March 9, 2014).