留学群托福阅读频道针对广大网友的建议精心整理了托福阅读有关资料，包括托福阅读真题、托福阅读模拟、托福阅读练习、托福阅读预测、托福阅读资料和托福考试高分技巧等，希望能帮助各位考生。
很多动物都会储存食物，而这需要一定的记忆力。在下面的新托福考试阅读练习资料中将介绍一种记忆力惊人的鸟类。
Humans may be one of the smartest animals on the planet, but when it comes to remembering where things are, Clark’s nutcrackers have us beat.
A relative of jays and crows, nutcrackers hide pine seeds in the ground each autumn so they have a source of food during the Colorado Rocky Mountain winter. They cache as many as 30,000 seeds in 5,000 different locations over a fifteen square mile area. Since they cannot smell the seeds buried in the soil very well, they must use their remarkable spatial memory to find them.
Nutcrackers are not the only animals that cache food. Caching behavior is seen in birds, mammals and even insects. Chickadees store collections of seeds, insects and spiders in the bark of trees or under leaves. Red squirrels cut conifer cones from trees and bury them in plant litter on the forest floor. Harvester ants bring seeds back to their nests and store them in chambers, while honey bees save nectar and pollen in their hive.
Because nutcrackers are one of the best at remembering cache locations, researchers are studying them to find out why they have such great memories. Scientists know that the nutcracker’s abilities evolved because of environmental pressure. Nutcrackers with poor memories did not likely survive the harsh mountain winters. Now resear...