CONCEPTS 9-1A AND 9-1B 187
Grizzly bear Kirkland’s warbler Knowlton cactus Florida manatee African elephant
Utah prairie dog Swallowtail butterfly Humpback chub Golden lion tamarin Siberian tiger
Giant panda Black-footed ferret Whooping crane Northern spotted owl Blue whale
Mountain gorilla Florida panther California condor Hawksbill sea turtle Black rhinoceros
Figure 9-4 Endangered natural capital: some species that are endangered or threatened with premature
extinction largely because of human activities. Almost 30,000 of the world’s species and roughly 1,300 of those
in the United States are officially listed as being in danger of becoming extinct. Most biologists believe the actual
number of species at risk is much larger.