A house for a snail

The snail, slimy and wet,
has a lot of fun in the forest when it rains.
Crawls over hill and dale
and many a leaf tastes fine.
She gets tired after a while.
But there's not a cottage in sight.
The Casa children in the forest
build her a little house soon.
There it is safe from weather and wind,
until she sets off again, swiftly.