The Pterrible Pteranodon von Tom M Franklin

A steam-driven mechanical pteranodon is out of control over Victorian-era London and the Queen is not amused! Ib believes his luck has changed for the better when he gets the chance to be an eccentric professor's assistant. However, when the professor's gearwork pterosaur comes to life and escapes into the skies, Ib wonders what else can go wrong. Then Her Majesty's Royal Guard gives Ib and the professor two days to capture their renegade machine or end up in prison. When the professor is arrested, it is left to Ib to come up with an extraordinary plan to save them all!