American pikas or rock rabbits, a relative of rabbits and hares, might be the first of these species to go extinct due to climate change. About 7­8 inches long, pikas live high in the cool, damp mountains west of the Rocky Mountains. As global temperatures rise, they would naturally migrate (迁徙) to higher ground — but they already occupy the mountain tops. They can't go any higher. The National Wildlife Federation reports that they might not be able to stand the new temperatures as their habitat beats up.itable plants for them to move higher, so they are stuck in the middle. Scientists are concerned about their populations.

　　Native to the US, pygmy rabbits weigh less than 1 pound and live in the American West. They are believed to be the smallest rabbits in the world. Their habitats have been destroyed by development. Several populations, such as the Columbia Basin pygmy, almost went extinct and were saved by zoo breeding programs. Pygmy rabbits also rely on winter cover by digging tunnels through the snow to escape predators, but lesser snowfall is leaving them exposed.

　　All of this gives new meaning to dressing up in a giant bunny costume this Easter.

　　1. The writer mentions Easter at the beginning of the passage in order to ______.

　　A. show the importance of Easter Day

　　B. introduce the issue about bunnies

　　C. remind people of Easter traditions

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