Some people suffer from recurring nightmares about being naked on stage, or not having revised for their exams. My bedtime terror is different — I'm gripped with fear that I haven't fed or watered my childhood budgie, with potentially devastating consequences. I loved that bird, Joey, so much, despite the fact that she unmasked herself as female after I'd named her, I still have a tiny box filled with her discarded green feathers. I've never owned a pet as an adult. I prefer animals in novels to avoid the horror of finding two cold, clutched feet in the air. Here are three whose company I enjoy. I think you will, too.