We once had a very amusing expedition to Gamlingay heath in search of Natter-jacks. Darwin was very succesful in detecting the haunts of these pretty reptiles and catching them. He brought several to Profr Henslow who said laughingly – well Darwin "are you going to make a Natter-jack pie?" It was on this day that he was very succesful in finding plants: particularly the Anemone pulsatillus and the Colchecum antennuatus which had never before been found except on the Gogmagogs and in L'Osbornes park.
(Rodwell, John Medows. : [Recollections of Darwin in Cambridge.] )