If you’re not familiar with the Terrapin Tally, it’s a citizen-science project that started as a pilot program on Masonboro Island in 2014 to collect data about the diamondback terrapin. Now in its seventh year, it’s going to be bigger than ever. State and local agencies have expanded the count to 10 sites, and are hoping to recruit a couple hundred volunteers to help. Those interested can sign up for training sessions that take place Thursday, April 8 and Saturday, April 10. 1. You probably live close to one of these turtles, but may not know it. Diamondback terrapins, known for a pretty spotted pattern on their head and spiral patterned shell, are found in salt marshes, estuaries, and mangrove swamps along the East and Gulf Coasts of the U.S. They usually live in one area throughout their lives in protected waters behind barrier islands and tidal creeks – hidden among the marsh and cord grass. They will bury themselves in mud and can hold their breath for 45 minutes to five hours.