I don't recall that one, and I thought I knew Gerald Durrell's work pretty thoroughly. There is a book of that title by Tim Cahill, though; maybe that's what you're remembering?
I would have thought that lots of folks had watched the "The Durrells in Corfu" TV series (PBS Masterpiece Theatre) and then did some research on the family.
I don't know whether this is available online, but I can recommend it as a pleasant programme, with lovely scenery, interesting storylines, and engaging actors.