A tale of sheep and gulls

This morning I set off to see what interesting ships there might be tied up in Peterhead harbour. En route I passed this colourful flock of yowes which opened up a memory of my primary school days in rural Yorkshire. Mistress Machum the primary teacher, who was a farmer's wife, was busy teaching us the ancient way to count sheep.
 
Yan (1), Tan, Tethera, Methera, Pimp, Sethera, Lethera, Hovera, Dovera, Dik(10), Yan Dik, Tan Dik, Tethera Dik, Methera Dik, Bumfit (15), Yan Bumfit, Tan Bumfit, Tethera Bumfit, Methera Bumfit, Jigget (20).

Extra. In Peterhead the gulls were patiently lining up in the dinner queue.