Bird Dropping Spider (Common misnomer for Bolas Spiders or Bird Dung Crab Spiders)
Scientific Name: Phrynarachne spp. (Crab spiders) or Mastophora spp. (Bolas Spiders)
Order & Family: Order: Araneae, Family: Thomisidae (Crab spiders) or Araneidae (Orb-weavers)
Size: Females typically range from 8mm to 15mm, while males are significantly smaller (usually 2mm to 3mm).
Natural Habitat
Typically found on leaves, branches, or near foliage in gardens, woodlands, and orchards, where their camouflage is most effective against predators.
Diet & Feeding
Carnivorous; they feed on moths and other flying insects. Some species release pheromones that mimic female moths to lure male moths closer.
Behavior Patterns
These spiders are famous for their aggressive mimicry and camouflage. They look remarkably like a fresh bird dropping (a white, chalky section and a dark section) to deter predators like birds. They are generally sedentary during the day, relying on this disguise.
Risks & Benefits
Benefits: They act as natural pest control by eating moths and other insects. Risks: They are generally harmless to humans. While they have venom, they are docile and rarely bite unless provoked, and their venom is not considered medically significant for people.
Identified on: 2/20/2026