Thomisus onustus, commonly known as the Heather Crab Spider, is a remarkable ambush predator belonging to the family Thomisidae. It is widely distributed across Europe, North Africa, and parts of Asia, where it typically inhabits flower-rich meadows, scrublands, and heathlands. 
 
Key Characteristics
Color Changing: Females are famous for their ability to change color between pink, yellow, and white over several days to match the flowers they are perched on, providing near-perfect camouflage.
Sexual Dimorphism: This species exhibits significant differences between sexes:
Females: Larger (7–10 mm), with a distinctly triangular abdomen characterized by prominent rear corners.
Males: Much smaller (2–4 mm), slender, and usually a drab green or brown color.
Hunting Behavior: Unlike many spiders, they do not build webs. Instead, they use powerful front legs to snatch pollinators such as bees, butterflies, and hoverflies that visit their host flowers.
Dietary Rareness: While primarily carnivorous, they are also known to supplement their diet with pollen and nectar when insect prey is scarce.