Bird Song

The calls of thousands of sparrows can be ____.

• hear

• hears

• hearing

• heard

These little brown birds know only ___ songs.

• few

• a few

• little

• a little

Baby swamp sparrows learn to communicate by ____ adults.

• copy

• copies

• copied

• copying

Swamp sparrows very rarely make ____ when they learn songs.

• mistake

• mistakes

• mistaken

• mistakenly

Until recently, this ___ ability was thought to be special only to humans.

• learn

• learnt

• learns

• learning

The researcher used computer software ___ each song into a collection of notes.

• break

• breaks

• to break

• breaking

The research revealed that only 2 percent of male sparrows ___ a different song.

• sing

• sings

• sang

• sung

You end ___ with traditions that are really stable.

• of

• at

• up

• on

Another aspect scientists are now exploring is the ____ of habitat.

• impact

• evolve

• aspect

• humans

These barriers may prevent ____ interaction between songbirds populations.

• culture

• cultures

• cultural

• culturally