I'm a fan of Gerald Durrell's books and may therefore have been biased towards this film adaptation, of his renowned autobiography, but I can't believe that there are many who wouldn't thoroughly enjoy this film.
The first time I watched this, although a little incapacitated on a New Years Day, I was so entertained that I proceeded to watch it again immediately, and watching a film twice is a very rare occurrence for me.
If you are at all fond of animals then you will also be delighted with the host of critters, feathered and furry creatures that star in the film.