Reef Stonefish
Up to 40 cm. Camouflaged perfectly as a rock or coral. 13 dorsal spines deliver venom when stepped on. Found in Red Sea and East African coast.
Sting causes excruciating pain (worst pain known to humans), tissue death, paralysis, heart failure. Antivenom exists. Few deaths now, but injuries common.
Red Sea — Egypt, Sudan, Eritrea, Djibouti. East African coast — Kenya, Tanzania, Mozambique. Indian Ocean reefs.
Almost motionless — relies entirely on camouflage. Buries partially in sand. Most stings: tourists wading without reef shoes.