I dunno.... they moo!

Burds are my own creation, and are about the size and throwability of a softball. But I wouldn't throw one unless you really really wanted to, and you'd probably fluster the poor thing. Each one is quite squeezable and soft. Burds do fine on their own but the larger the group, the more likely they are to plot world domination...errr, evil master plans... errr, zen meditations! I make each one individually from my own pattern.