**Description:** A medium-sized, long-tailed bird with a blue back, white belly, and a prominent crest.
**Size & Weight:** 9–12 inches long. Weighs 2.5–3.5 oz.
**Sexual Dimorphism:** Monomorphic; sexes look identical.
**Behavior:** Highly intelligent and social; they are famous for imitating hawk calls to clear other birds away from food. Essential for forest regeneration by "planting" acorns.
**Habitat:** Mixed woodlands, especially those with Oak and Beech trees.