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Summary
Fill in the blanks.
In the past 300 years, the rate of extinction of living things has
increased. There were once billions of passenger pigeons. But
people started killing them. The birds were easy to catch, so their
numbers were reduced quickly. The last passenger pigeon died
in 1914. Miss Waldron’s red colobus monkey was first discovered .
in 1933. But people reduced its habitat to get diamonds. Nobody
has seen one of the monkeys for many years, so scientists
declared it is extinct .
was first discovered the rate of extinction
declared it is extinct numbers were reduced
Unit 11 | What We've Lost
