Interesting, they are both latrodectus species, and (according to wikipedia) the brown widow has venom that is more potent in mice (0.43 mg/kg LD50 vs 1.39 mg/k

Interesting, they are both latrodectus species, and (according to wikipedia) the brown widow has venom that is more potent in mice (0.43 mg/kg LD50 vs 1.39 mg/kg), it's just that they can't inject very much of it. Huh. The redback here in Aus is likely somewhere between the two...