Keats and Chapman Examine the Avifauna

Keats popped out one afternoon to the off-licence and encountered Chapman, who was dressed in a camouflaged hat and jacket and rubber boots and was carrying binoculars and a telescope.
Said Keats "Where are you off to?"
Chapman replied "I'm off to the marshes. I've taken up orthinothonology."
"Oh!" said Keats. "you sound like a word-botcher."