This app is free today via apps gone free and is another good app that allows children to learn and create. In the models section there are 12 animals to create, some scaffolded with the shapes showing.
The shapes are drag and drop- easy for little fingers to manoeuvre. The build section lets you explore your creativity, then allows you to move your creation around the screen, save it and photograph it.
It's a great little freebie that once again satisfies elements of the computing curriculum at ks1.