What is a group of bowtruckles called?

A group of bowtruckles is called a cluster. Bowtruckles are small, tree-dwelling creatures with long, sharp fingers that they use to pick insects out of wood. They are known for being shy and elusive, and are often found living in wand trees, which are trees that are specially selected and grown to make wands. Bowtruckles are loyal and protective of their chosen tree, and have been known to attack anyone who threatens it. In the wizarding world, bowtruckles are often kept as pets by witches and wizards who work with wandlore.