Black ants are worshiped in my community. Spotting black ants is considered omen.
Ever wondered why? 
Pranamaya Kosha of Mother earth that helps black ants to emerge in environment is a sign of healthy environment! Right moisture, right temperature!
Unlike cockroaches, mosquito, red ants, rats etc. They too emerge at specific temperature, under specific moisture condition and with lots of nitrate in food. Unwelcome because the Prana is NOT compatible for healthy life. Malaria to plague to dengue!
Think about it. Think and sense life in terms of life-force, the Prana!
More about it discussed here:
- Several research papers supporting the prana hypothesis discussed above
- Disease-carrying mosquitoes abound in deforested lands
- Deforestation and vector-borne disease: forest conversion favors important mosquito vectors of human pathogens
- Impacts of Deforestation on Vector-borne Disease Incidence
- How Forest Loss Is Leading To a Rise in Human Disease
