Green Bottle Fly

Lucilia sericata — the green bottle fly, also called the sheep blow fly — is one of the most consequential medical insects in modern healthcare and a centerpiece species of forensic entomology. Adults are 8-12 mm with brilliant metallic green-bronze bodies and red-orange compound eyes; the species is one of the most familiar 'green bottle' flies in temperate human environments. The species has two major roles in modern human industry. First, MEDICAL MAGGOT THERAPY: green bottle fly larvae are FDA-approved (since 2004) for clinical wound debridement therapy. Sterile lab-reared larvae are placed in chronic non-healing wounds (diabetic foot ulcers, pressure sores, post-surgical wounds, burn wounds) where they perform three therapeutic functions simultaneously: (1) DEBRIDEMENT — they consume dead, necrotic, and infected tissue while leaving healthy tissue alone (the larvae have specific enzymatic preferences for dead protein); (2) ANTIBACTERIAL — they secrete potent antimicrobial peptides (notably defensin-like compounds) that kill MRSA, Pseudomonas, Streptococcus, and other resistant bacteria that conventional antibiotics struggle with; (3) STIMULATION — they secrete growth factors that accelerate granulation tissue formation and wound contraction. The technique is used clinically across thousands of US, UK, and European hospitals and is one of the most-cited examples of 'living drug' medical biotechnology. Second, FORENSIC ENTOMOLOGY: green bottle flies are typically the FIRST insects to colonize a fresh human corpse — adults arrive within minutes of death (drawn by sulfur volatiles from beginning decomposition) and lay eggs on the body. The precise developmental timeline of green bottle fly larvae (egg → 1st instar → 2nd → 3rd → pupa → adult) is temperature-dependent and well-characterized, allowing forensic entomologists to estimate post-mortem interval (time of death) to within hours for bodies in the first 1-2 weeks. The species is a foundational organism in modern forensic entomology curricula. The species also has historical significance in agriculture — sheep blow fly strike (where larvae develop in living sheep wool and damage the host) is a major Old World sheep industry concern.