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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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If you’ve ever been to an all-you-can-eat buffet, you know how important it is to carefully weigh your options.

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You don’t want to fill up on salad when so many calorie-laden delights await.

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It seems some birds also weigh their mealtime choices literally.

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A study finds that Mexican Jays pick up and shake peanuts to assess their relative heft before choosing one.

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That report is served up in the Journal of Ornithology.

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Foods that hide their edible bits on the inside present a challenge to hungry diners.

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How can you tell which fruits are ripe or which shells harbor the biggest nuts?

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We humans knock on melons or squeeze avocados.

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But how do other species select the highest quality snacks?

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To find out how the jays do it, researchers fiddled with their feed.

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First they doctored peanuts so that some contained three nuts while others had none.

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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.

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And when the jays were allowed to choose between normal peanuts and those that weighed just one gram more,

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because the researchers had stuffed them with clay, the birds again went for the heavier meal.

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Videos revealed that the jays shake the nuts before selecting one,

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which apparently lets them gauge the nut’s mass and perhaps also listen for the rattle of a well-packed shell.

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Pretty clever for a bird brain.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.

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1 / 19
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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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2 / 19
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If you’ve ever been to an all-you-can-eat buffet, you know how important it is to carefully weigh your options.

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3 / 19
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You don’t want to fill up on salad when so many calorie-laden delights await.

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4 / 19
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It seems some birds also weigh their mealtime choices literally.

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5 / 19
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A study finds that Mexican Jays pick up and shake peanuts to assess their relative heft before choosing one.

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6 / 19
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That report is served up in the Journal of Ornithology.

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7 / 19
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Foods that hide their edible bits on the inside present a challenge to hungry diners.

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8 / 19
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How can you tell which fruits are ripe or which shells harbor the biggest nuts?

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9 / 19
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We humans knock on melons or squeeze avocados.

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10 / 19
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But how do other species select the highest quality snacks?

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11 / 19
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To find out how the jays do it, researchers fiddled with their feed.

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12 / 19
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First they doctored peanuts so that some contained three nuts while others had none.

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13 / 19
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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.

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And when the jays were allowed to choose between normal peanuts and those that weighed just one gram more,

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15 / 19
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because the researchers had stuffed them with clay, the birds again went for the heavier meal.

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16 / 19
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Videos revealed that the jays shake the nuts before selecting one,

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17 / 19
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which apparently lets them gauge the nut’s mass and perhaps also listen for the rattle of a well-packed shell.

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18 / 19
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Pretty clever for a bird brain.

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19 / 19
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Thanks for the minute, for Scientific American's 60-Second Science. I'm Karen Hopkin.

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