Advertisement Hello, I owned a handsome male Johnson Jumping Spider. I’ve had him since he was too young to sex. I really came to adore the thing. But sadly today I came home to find him hanging dead in his enclosure. Nothing had seemed out of place and he had just ate a moose fly the other day. upon further inspection I saw mites crawling around his mouth. I don’t know were they came from or if they are the cause of his death.