Finding an Owl Solo/Open Closed

Joey had never been up to the owlery before. He had never had a reason to, not having his own owl and having never needed to send a letter before. He had written a letter that very morning, asking his mum to send his watch and telling her about everything that had happened since he had left. He had hurried up to the owlery at his first oppertunity - lunchtime - after scoffing down a sausage roll and a pasty.
He stepped inside. Crunch. He lifted his foot and moved aside, letting more light in through the doorway behind him. He had stepped on the small skull of a mouse. Kicking it aside, he stepped forwards. It was dark, damp and quiet, apart from the odd rustle of feathers. How would he know which ones were the school owls? He didn't want to send someones personal owl delivering a letter for him. He started up the stairs, spiralling the the inner wall of the small tower, towards the top, where most of the owls seemed to be perched.
He looked around and presumed the barn owls were the school ones, since they were, by far, the most common. He pulled the letter out of his pocket and without any prompting, one of the owls that wasn't asleep flew over and held out its leg ready for him to attach the letter.
He tied it securely to the outstretched leg, but the owl just sat there and looked at him expectantly - obviously it couldn't read the address on the letter. He told it to whom and where to deliver the letter and it launched itself out of the window.
Joey watched the owl fly off into the horizon before turning around and heading back down the stairs. He had a lesson to get to.