Photo © Andy Mitchell
Furcula bicuspis, the alder kitten, is a moth of the family Notodontidae. The species was first described by Moritz Balthasar Borkhausen in 1790. It is found in most of the Palearctic realm.
The wingspan is 30–35 mm. The moths are on wing from May to July depending on the location.
The larvae feed on Betula species and Alnus glutinosa.
Source: Wikipedia
The primary larval foodplants are Alder (Alnus glutinosa) and birches (Betula spp.).