One Of Our Dinosaurs Is Missing

We arrived at Bad Granny and Prickly Grandad's house after a hot drive, in time to see Andy Murray play in the Wimbledon final. Well, I slept though at least half an hour, which was probably just as well given the rest of the time Mr HPW was getting annoyed with me not understanding how tennis is scored, or indeed anything about it. Meanwhile, in the garden, small boys were looking for a dinosaur.

Where's it gone?