Marsh Dalek
From Tardis Wiki, the free Doctor Who reference
The Marsh Dalek was a non-canon variant dalek, from one of the 1960s Dalek Christmas Annuals.
Structurally it resembled a cylindrical tin can on thin legs, with an eye-stalk. Functionally it was supposed to be there to control mutant creatures in the marshes of Skaro.
Presumably, with the destruction of Skaro, the sub-species became extinct.
