the mcmahon's viper is said to be nocturnal, but some say it is crepuscular, meaning it is active during the early morning or late evening. it is able to sidewind on loose sand, and sometimes climbs into bushes. it is a aggressive snake, hissing very loudly when disturbed or annoyed, and sometimes it raising its head of the ground and starts striking aggressively. it is able to sink into the sand by moving in a rocking motion. when it sinks into the sand it leaves its eyes and snout sticking out of the sand.