The extinction of passenger pigeon was due to

Options

A. increased number of predatory birds.
B. over-exploitation by humans.
C. non-availability of the food.
D. bird flu virus infection.

Answer

B

Explanation

Explanation : Extinction of passenger pigeon (Ectopistes migratorius) was due to the combined effects of their natural dramatic population fluctuations and human over-exploitation. Factors like increase in number of predatory birds, non-availability of food and bird flu virus infection did not contribute to the extinction of passenger pigeon.