Millions of animals call Earth home, but many of them have become endangered or are threatened with extinction due to human activities. This title examines some of the greatest threats animals are facing today, including habitat loss, poaching, and pollution. It also looks at steps being taken to help endangered species recover, ways in which activists have contributed to conservation efforts, and how everyday people can get involved. Features include a glossary, references, websites, source notes, and an index. Aligned to Common Core Standards and correlated to state standards. Essential Library is an imprint of Abdo Publishing, a division of ABDO.