Crash and Eddie are two fraternal twin brother opossums that appear in the second film. These two brothers were the adopted brothers of Ellie the mammoth, but cared for her all the same, even teaching her to hang by her tail from a tree branch when she slept as they did.

Didelphimorphs are small to medium-sized marsupials, with the largest about the size of a large house cat, and the smallest the size of a mouse. They tend to be semi-arboreal omnivores, although there are many exceptions. Most members of this taxon have long snouts, a narrow braincase, and a prominent sagittal crest.

第二部《冰河世紀(jì)》中增加了一頭老以為自己是負(fù)鼠的女猛犸象，還老愛(ài)學(xué)兄長(zhǎng)把自己給倒吊在樹(shù)枝上。那么負(fù)鼠又是一種怎樣神奇的動(dòng)物咧？

負(fù)鼠是有袋目負(fù)鼠科的通稱(chēng)。是一種比較原始的有袋類(lèi)動(dòng)物，主要產(chǎn)自拉丁美洲。為中、小型獸類(lèi)。大多數(shù)具有能纏繞的長(zhǎng)尾，因此母負(fù)鼠能隨身攜帶幼鼠到處奔跑。尾毛稀疏并覆以鱗片。少數(shù)種類(lèi)尾短而具厚毛。四肢短，均具5趾。拇指大，無(wú)爪，能對(duì)握。平時(shí)，負(fù)鼠喜歡生活在樹(shù)上。它行動(dòng)十分小心，常常先用后腳鉤住樹(shù)枝，站穩(wěn)之后再考慮下一步動(dòng)作。它們會(huì)在疾奔中突然立定不動(dòng)，捕捉它們的動(dòng)物往往會(huì)被這個(gè)動(dòng)作嚇得大吃一驚；負(fù)鼠在來(lái)不及躲避敵害時(shí)，往往裝死，這不是它聰明的舉動(dòng)而是它被嚇的暫時(shí)的休克。