I found this book in Australia, and bought it there. On return to the U.S., my sons and I spent night after night reading it to each other and acting out the illustrations. The text is simple - aimed for the youngest reader - but humourous, and the illustrations are absolutely charming.
The book chronicles a week in the life of a wombat and its human "pets" - all from the wombat's point of view. Many "entries" in the diary reflect the wombat's nocturnal nature ("Monday - Morning: Slept; Afternoon: Slept...). The humour and charm stem from the animal's interaction with the world around it - battling a "welcome" mat, discovering an endless supply of carrots (the garden), tackling wet laundry on the line, communicating its desires to the humans (by bashing trash bins, chewing flower pots)...
The book's humour is comparable to "Click Clack Moo" and "Giggle Giggle Quack", but the text is easier for youngsters to read themselves. The adult readers (both in Oz and America) were delighted with the book, and several teachers requested copies. It is not available in the U.S., and I was very grateful to obtain a copy for our school library through amazon.co.uk marketplace. Also, the U.K. version contained an additional page explaining "I am a wombat, a nocturnal animal..." which is an excellent addendum to the original book.