RRB39 Hey, who's in the loo? Children's book by Harmen Van Straaten

Bear really needs the loo, but it's otherwise engaged!
Who's taking so long, and why?
Bear can't hold out much longer, he's desperate, but the door is locked and the toilet is occupied.
He is soon joined by Pig, Elephant, Tiger, Penguin, Monkey and Giraffe who are all need to go too!

Paperback