I Spy...

"I spy with my little eye something beginning with s," said Harry, as he looked out of the window of the train.
"Sheep?" said his sister, Poppy.
"Nope."
"Scenery?" said his mother.
"Nope."
"Squirrel?" said Poppy.
"Nope."
"We give up, don't we Mum?" said Poppy.
Her mother nodded.
"Shitehawk," said Harry.
"There's no such thing," said his mother.
"Dad says shitehawk all the time," Harry protested.
"Your father says plenty of things but that doesn't mean they're right."
"I saw one hovering at the side of the track," said Harry.
"That was probably a kestrel, now just forget about shitehawks."