How many football players are there in each team?

pigeons

rattlesnakes

owls

humans

in the wild

on the East Coast

in mountainous areas

in office buildings

developed

authorized

disseminated

prohibited

because they were prized by hunters and hunted to near extinction

because of pesticides used by American farmers

because they ate birds from other countries where DDT was still used

because they migrated to countries where their eggs could not survive

harmful effects of pesticides

endangered species

survival of peregrine falcons

releases into the wild

Companies remove the stone to construct modern buildings.

There were once used as a hiding place.

People explore them even though it's not permitted.

People grew mushrooms there.

going up  

going down

walking through

coming across