a mole(鼹鼠) is built very well for digging. it can dig at a rate of 3.5m per hour. moles dig a whole network of tunnels underground. the first kind is close to the surface. these tunnels are not really constructed at all. they just happen as the moles push through the earth when hunting for food. moles don’t take away the soil from these tunnels. they just push it aside as they move along. the second kind of tunnel is deeper. moles use these tunnels to get to their hunting grounds and back home to their nests. the nests are lined with grass and leaves. moles dig an escape tunnel starting downwards away from the nest, and then up to the surface for a quick getaway if there is danger.
how does a mole get rid of all the earth it digs out of its nest and tunnels? as the mole digs with its two front paws, it pushes the earth under its body. then it uses its back paws to kick the earth behind it out of its way. after digging like that for a while, the mole turns around and pushes all this loose earth to the surface. the mole leaves the earth in piles called molehills. there are always several molehills together. they are clear signals that moles live nearby. the biggest molehill is right above the mole’s nest. the smaller molehills around it are made of the earth from the hunting tunnels.
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