Picture shows Placa de Valencina, undated. Researcher Juan Jose Negro suggests that the owl-shaped slate plates from 5,000 years ago could have been created by children to be used as toys, in a study conducted at the Donana Biological Station, in Sevilla, Spain. (Museo Arqueologico de Sevilla, Ministerio de Cultura/CEN)
Forget Lego, Barbie or even teddy bears, the world's first-ever kids toy craze was actually carved slate owls covered with real feathers according to latest research. Scientists believe the owls…