What's the best material for Key Stage 2 (under 11's) woodwork?

What's the best type of wood for Key Stage 2 children (under 11's) to use for workworking. I want my clas of children to make a bird box.

It needs to be fairly soft and easy to work with.

Answers:
Cedar is a great wood, easy to saw and makes a durable birdhouse.

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