'Ssssssssssss' Elsie hisses, pointing at a long snakey animal in her book. 'Yes,' I agree, 'it does look like a snake doesn't it, but it's actually a caterpillar' she looks at me uncertainly. 'ouww?' she wonders, unconvinced. 'No' I laugh, it's not a cat! A caterpillar. Remember the very hungry caterpillar in one of your other books?' She looks into my face, confused. 'Remember how the hungry caterpillar eats lots and lots and then turns into a butterfly?' Her features relax into comprehension. 'Mo-mo!'