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Last Updated: Friday August 06 2010 16:53 GMT

Harvest mice get tennis ball houses

Harvest mice are getting some rather unusual homes built for them - using tennis balls!

The mice are the smallest rodents in the UK and their habitat is under threat because it's being cut down to grow food for humans.

A tennis ball is ideal because it's the same size as a harvest mouse's nest. It's also brightly coloured so they can be easily tracked to see how many mice move in.

Hayley finds out how the 'mouse houses' are built here.