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By Allan B. Cobb

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The federal government has also enacted the Animal Enterprise Protection Act (1992). This law makes it a crime to cross a state border with the intent to physically disrupt zoos, aquariums, or similar public attractions, as well as to physically disrupt commercial or academic facilities that use animals for food production, research, or testing. S E E A L S O Animal Testing; Bioethics. Mark A. Thorburn Bibliography Bloyd, Sunni. Animal Rights. , 1990. Day, Nancy. Animal Experimentation: Cruelty or Science?

Sperm are then stored internally in the spemathecae, where they are used to fertilize eggs that are laid later. A large number of salamander species are actually direct developing, with eggs hatching directly into miniature adults. In this way, the aquatic larval stage is bypassed. Other species are perrenibranchiate, and never metamorphose. These species retain the larval morphology their entire lives. Among amphibians, only salamanders include perrenibranchiate species. The axolotl, a well-studied organism, is perrenibranchiate.

Segments at the front end of the animal are specialized to form suckers, while back-end segments are specialized for attaching to the host. The mouth contains teeth that are used to make an incision in the host. Leeches secrete an anticoagulant that keeps the blood of their host from coagulating, or clotting. They have been put to medical uses for thousands of years. In fact, bloodletting was extremely common as a standard prescription for a wide variety of ailments. The anticoagulants produced by leeches are still of great interest to medical scientists.

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