The demise of the passenger pigeon is a tragic example of the effect of human interests on nature.
Passenger pigeons once ranked amongst the most numerous birds on the planet. Their flocks were so huge that they could block out the sunlight for days, with their chattering heard for miles. A single tree could hold over one hundred nests. Unfortunately, their survival depended on large numbers.
One of the few survival strategies of passenger pigeons was predation satiation. The huge flocks needed large forests to nest in, and each nesting pair would lay only one egg. The pigeons would nurture their