# PTE RW FIB #6: Foraging Behavior and Decision...

Reading & Writing: Fill in the Blanks #6 - Level 1 - Feeds Reading

> Below is a text with blanks. Click on each blank, a list of choice will appear. Select the appropriate answer choice for each blank.

If you've ever been to an all-you-can-eat buffet, you know how ____ it is to ____ weigh your options. You don't want to fill up on salad when so many ____ delights await. It seems some birds also weigh their mealtime choices--literally. A study finds that Mexican Jays pick up and shake peanuts to assess their relative heft before choosing one. That report is served up in the Journal of Ornithology. Foods that hide their edible bits on the inside present a challenge to hungry diners. How can you tell which fruits are ripe or which shells harbor the biggest nuts? We humans knock on melons or squeeze avocados. But how do other species select the highest quality snacks? To find out how the jays do it, researchers fiddled with their feed. First they doctored peanuts so that some contained three nuts while others had none. When they offered these pods to some jays, the birds turned their beaks up at the empty shells and instead chose those that were full. And when the jays were allowed to choose between normal peanuts and those that weighed just one gram more, because the researchers had stuffed them with clay, the birds again went for the heavier meal. Videos ____ that the jays shake the nuts before ____ one, which apparently lets them gauge the nut's mass and perhaps also listen for the rattle of a well-packed shell. Pretty clever for a bird brain.

## Answer

If you've ever been to an all-you-can-eat buffet, you know how **important** it is to **carefully** weigh your options. You don't want to fill up on salad when so many **calorie-laden** delights await. It seems some birds also weigh their mealtime choices--literally. A study finds that Mexican Jays pick up and shake peanuts to assess their relative heft before choosing one. That report is served up in the Journal of Ornithology. Foods that hide their edible bits on the inside present a challenge to hungry diners. How can you tell which fruits are ripe or which shells harbor the biggest nuts? We humans knock on melons or squeeze avocados. But how do other species select the highest quality snacks? To find out how the jays do it, researchers fiddled with their feed. First they doctored peanuts so that some contained three nuts while others had none. When they offered these pods to some jays, the birds turned their beaks up at the empty shells and instead chose those that were full. And when the jays were allowed to choose between normal peanuts and those that weighed just one gram more, because the researchers had stuffed them with clay, the birds again went for the heavier meal. Videos **revealed** that the jays shake the nuts before **selecting** one, which apparently lets them gauge the nut's mass and perhaps also listen for the rattle of a well-packed shell. Pretty clever for a bird brain.

## Explanation

Blank 3 needs an adjective before "delights," and it should contrast with filling up on salad. "Calorie-laden" means rich in energy, which fits buffet treats. The other choices are nouns that cannot describe "delights." In blank 5, "before" needs an -ing verb, and "selecting" matches the jays choosing a nut.

## Hints

- Look at the words immediately preceding and following the blank to determine the required part of speech.
- Focus on the scientific context; the passage describes a study on how birds assess food quality.

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