 Guard bees of the "L. malachurum" species, which are workers that defend the nest, also demonstrate antagonistic behavior toward non-nestmate conspecifics, by orienting their stingers toward the intruders or blocking the entrance to the nest with their abdomens.They are able to discriminate between non-nestmates and nestmates, which they allow to pass with ease.Foragers, though, are either unable to discriminate between nestmate and non-nestmate conspecifics or are uninterested in pursuing aggression against non-nestmate conspecifics, so exhibit high levels of tolerance toward all conspecifics.