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Summary

Fill in the blanks.

Peregrine falcons disappeared east of the Mississippi River by

1965. DDT made their eggshells too weak . In 1970, scientists

started taking falcon eggs to hatch in laboratories . Then,

adult falcons raised the birds. Later, the scientists put young

falcons in a box high above the ground . The birds learned to

live on their own. By 1998, the birds were no longer

an endangered species .

hatch in laboratories an endangered species

their eggshells too weak high above the ground

Unit 12 | The Recovery of the Peregrine Falcon