Endangered Species and Conservation Efforts

What is the primary cause of the current high rate of plant and animal extinctions?

• Habitat loss

• Over-exploitation

• Pollution

• Climate change

Which species is North America's most endangered mammal?

• Black-footed ferret

• Mountain gorilla

• Javan rhino

• Amur leopard

What is the IUCN's criteria for classifying a species as endangered?

• Population decline by 50-70% or fewer than 2,500 mature individuals

• Population decline by 30-50% or fewer than 5,000 mature individuals

• Population decline by 70-90% or fewer than 1,000 mature individuals

• Population decline by 10-30% or fewer than 10,000 mature individuals

Which species has seen population increases due to conservation efforts in the Colorado River basin?

• Humpback chub

• Sockeye salmon

• Yangtze finless porpoise

• Black rhino

What is the main threat to the Yangtze finless porpoise?

• Environmental degradation and pollution

• Poaching

• Habitat loss

• Inbreeding