Yellow Door Let's Investigate - Woodland FootprintsExplore nature with these Woodland Footprint stones from Yellow Door. Let their imagination go wild as they make tracks and guess which footprint belongs to which animal! These Woodland Footprints are ideal for encouraging early investigation skills as they compare, sort and examine the different footprints. These durable and weatherproof stones can be used outdoors, to make tracks in the sand or mud or inside to make crayon rubbings, or prints in