ask

He looked at the beast. It was not an eel. It was very like an ask.

We hear of Adder dens, but detailed accounts of the discovery of one are very rare. Service (1902) records that a peatman, when levelling on an estate by the Solway, found in a hole in the ground, some 8 inches below the surface, 40 adders, 10 toads and a large number of asks (lizards).