Woodstock Whirlybirds

Just lie down with Woodstock in the nest. Woodstock was the little yellow bird that was always around Snoopy. A little bird needs a nest if it wants to grow up. And as befits a nest, it's pretty stable, but sometimes it moves a little bit...

Hints:
Height restriction: up to 1.02 m only when accompanied by an adult, from 1.52 m only when accompanied by a child
Age restriction: no restriction
Weight limit: no limit