What Were the Reasons That the Passenger Pigeon was Vulnerable

Question

What were the reasons that the passenger pigeon was vulnerable before it became extinct?
A) fires, drought, and heat
B) lack of food, lack of nesting sites, and lack of migration
C) human impact, small clutch size, and dramatic oscillations in population sizes
D) flood, hurricanes, and cold temperatures

Accepted Answer

The passenger pigeon was vulnerable to extinction due to human impact (such as hunting and habitat destruction), its naturally small clutch size (usually laying only one egg per nest), and dramatic oscillations in population sizes, which could lead to rapid declines.