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Chapter Thirteen - The Muggle-Born Registration Commission

While snooping around Dolores Umbridge's office, Harry learns that the ministry has placed a magical trace on Arthur Weasley. While such magical tracking devices do not exist in the muggle world, many animals rely on biological tracking techniques to track their pray. Bats, for example, use sonar to find food without sight or smell. Dolphins use a similar type of sonar. For this activity, see what you can learn about animal sonar. How does it work? What types of things does it help them locate?

Here are a couple helpful links to start your research:
http://www.dolphinkind.com/echolocation.html
http://light-science.com/bio2.html