Turtles and tortoises make a noise that will tell you quite definitively what's going on. It's tough to describe this tactfully, but some tortoises at the zoo

Turtles and tortoises make a noise that will tell you quite definitively what's going on. It's tough to describe this tactfully, but some tortoises at the zoo here were feeling particularly amorous one day and you could hear them from a quarter mile away. Watching the parents try to explain to their kids what was going on was good for a laugh though.