Think odd book challenges are confined to the US?
Here's a round-up of challenges in the UK:
The children’s author who has attracted most criticism is David McKee, the creator of characters including Mr Ben, Elmer the Patchwork Elephant and King Rollo.
Criticism centred on three books Tusk Tusk, about a dispute between black and grey elephants, which parents said was racist; Denver, which is accused of supporting wealth inequality, because the title character is far richer than the others; and Two Monsters, which features two bickering characters.