I suspected it was an adult fox skull because it had a long, slender snout, and I knew their skulls are about 14cm long, and mine measured exactly that. It also had 42 teeth which is the amount of teeth for an adult fox, and there were incisors that meant it must be able to eat meat. I also found out foxes are very common in English cities and Bristol has the third largest population of urban foxes in the UK. There are about 16 foxes per square kilometre in Bristol compared to the countryside where there are only two per square kilometre.