The Caledonian Crows Hook a Treet

What is the central idea of “New Caledonian Crows Hook a Treat”?

• Crows carve out sticks, twigs, and leaves to use as tools.

• Crows perfect the use of tools through repetitive practice.

• People study captive crows because observing crows in the wild is difficult.

• People can teach crows how to use tools to extract food from holes and crevices.

Read the summary of part of “New Caldeonian Crows Hook a Treat.”

The stick, hook, and leaf tools made by crows are used to extract grubs from both dead and live logs and trees. Crows use these tools in a variety of ways. They use rapid movements when prey is buried under leaves. Slower movements help crows hook food in a small hole. Crows may also use slow movements when the food source is not visible.

What is the central idea of this paragraph?

• Crows find grubs in logs and trees.

• Crows use tools in a variety of ways.

• Crows find food in many different places.

• Crows use slow movements to hook food.

Which details from the article support the author’s finding that “New Caledonian crows have exceeded the skills demonstrated by all other nonhuman species”? Choose TWO correct answers.

• Crows use tools primarily to extract food.

• Crows are the first species observed to use hooks as tools.

• Crows use sticks, stems, twigs, and leaves as tools.

• Crows manufacture specific tools for different functions.

Which evidence from the article BEST supports the conclusion that tool use in crows has a genetic basis and is not transmitted through imitation?

• Tool types are similar across different groups of crows.

• Crows often take their tools with them to be used at a new site.

• Crows in captivity use stick tools in similar ways to crows in the wild.

• The shape of the leaf tools of various groups of crows varies across New Caledonia.

Read the following sentence from “New Caledonian Crows Hook a Treat.”

To investigate the crows’ abilities more closely, captive studies have documented the development of tool use by naïve hand-reared crows.

What does naïve mean in this context?

• foolish

• trusting

• inexperienced

• unsophisticated

How does the fable “The Crow and the Pitcher” support the central idea of “New Caledonian Crows Hook a Treat”?

• It shows that crows are patient.

• It shows how a crow is unique.

• It shows that crows need water.

• It shows how a crow uses tools.

Which word correctly completes the following sentence?

The scientists made notes to record their _____ of the chicks’ growth and behavior.

• observant

• observing

• observation

• observational

Which word correctly completes the following sentence?

Eagles have _____ sight that enables them to see prey from a far distance.

• except

• exception

• exceptional

• exceptionally

Compare "New Caledonian Crows Hook a Treat" with the "Crow and the Pitcher". How are the central ideas similar to each other? How are they different?