I love to rise in a summer morn
When the birds sing on every tree
The distant huntsman winds his horn
And the sky-lark sings with me
O! what sweet company
The birds singing ‘on every tree’ is an affirmation of the natural world and the joy it brings.  Blake was aware that children relate to birds and animals by creating in their imaginations ‘friendships’, attributing human characteristics to the creatures around them.
The Schoolboy