An engineering wonder which requires no environment-damaging batteries! Designed with a body that moves in wave-like motion when pulled, producing rhythmic 'click-clack' sounds. Suitable for crawlers and early walkers. Encourages active imaginations while developing balance and bilateral coordination. Constructed from chemical-free, kiln-dried recycled rubber wood. Assembled with formaldehyde-free E-zero Glue and coated with non-toxic, water-based dyes.