The Mystery of Vanishing Black Widows Solved by Scientists.
Originally Published 2 years ago — by Mashable
Brown widows are driving Southern black widows out, in part by attacking and killing the well-known arachnids. Biologists observed that brown widows were 6.6 times more likely to aggressively attack the black widows compared with other spider species. Brown widows can produce more offspring, because they can reproduce earlier in their lives and lay more eggs. The displacement and decline of Southern black widows could impact the existing native ecological relationships in the natural world.