Context: However, excessive hunting and poachers have also contributed heavily to the endangerment, extirpation and extinction of many animals, such as the quagga, the great auk, Steller's sea cow, the thylacine, the bluebuck, the Arabian oryx, the Caspian and Javan tigers, the markhor, the Sumatran rhinoceros, the bison, the North American cougar, the Altai argali sheep, the Asian elephant and many more, primarily for commercial sale or sport. All these animals have been hunted to endangerment or extinction.

Question: What has excessive hunting contributed heavily to?
Answer: the endangerment, extirpation and extinction of many animals

Question: What do Steller's sea cow, the bluebuck, and the Javan tigers all have in common?
Answer: extinction

Question: Why have poachers killed endangered animals?
Answer: primarily for commercial sale or sport.

Question: How have the North American cougar and Asian elephant been hunted?
Answer: to endangerment or extinction

Question: How is excessive hunting related to the extinction of species?
Answer: contributed heavily

Question: What contributes to endangerment?
Answer: excessive hunting

Question: What have poachers contributed to hunting?
Answer: endangerment

Question: What is the main predator of the quagga?
Answer: Unanswerable

Question: What animal was hunted mainly by Javan tigers?
Answer: Unanswerable

Question: What animal could usually be found with the markhor?
Answer: Unanswerable

Question: The thylacine usually tried to avoid which animal?
Answer: Unanswerable

Question: Which animal was similar to the North American cougar?
Answer: Unanswerable