Black wasps in Australia are commonly identified by their dark black or bluish bodies, slender waists, and long wings. Most species are solitary and non-aggressive, stinging only when threatened or disturbed. They play an important role in controlling pests such as spiders and insects. Black wasps are more active during warmer months and often nest in soil, mud structures, or roof eaves. While generally safe, caution should be taken around nests, especially for people with sting allergies.