Found: An Electric Blue Tarantula and More Than 30 Other New Species.
Upon closer inspection, he found several other bright blue arachnids inhabiting the tree, an uncommon behavior among typically solitary tarantulas. "What did this mean for this species? Were the holes interconnected inside?" Snyder says. "Is this species communal, or did they just tolerate each other?"
https://www.atlasobscura.com/articles/found-blue-tarantula-new-species-guyana-rainforest