美国加州大学戴维斯分校的科学家最近发现，加州地松鼠（ground squirrels）和岩松鼠（rock squirrels）会咀嚼响尾蛇皮，并将其涂抹在自己皮毛上，以此掩盖自身气味，防御捕食者攻击。
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David's rock squirrels only scatter hoarded walnuts;
岩松鼠只选择核桃进行分散贮藏；
He was visibly relaxed, using his heels to rock the porch swing back and forth. Observing the 1 antics of squirrels in a cluster of 2 pecan trees. 3 Gauging the weather with squinting eyes.
他显然很放松，时而用脚后跟蹬地，坐在门廊的秋千上来回摆动，时而注视着那些松鼠在一丛山核桃树上的滑稽举动，时而眯着眼预测天气。
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