...which is just as well, because there are an awful lot of 'em around at the moment.
But Lou and Dan have cooked up a cracker in "My Digger is Bigger", featuring a crazy selection of animals and their favourite vehicles.
Rhino (naturally) loves a big huge digger, cheetah nips past in his sleek and speedy new car, and Holly Hornet lights up the sky in her superfast jet.
But which vehicle is best?
All kids will have a favourite, and there's a rather neat foldout lift-the-flap surprise at the end of the book to delight little ones. It's a colourful treat, don't miss it!
"My Digger is Bigger" by Lou Kuenzler and Dan Taylor is out now, published by Scholastic (kindly supplied for review)