Chironex fleckeri, known as the most dangerous cubozoan jellyfish, uses its extremely toxic venom to capture prey and deter its predators. The venom is injected into the prey or predator upon stimulation of specialized stinging pockets, mostly found in the tentacles. Once stung, the venom causes excruciating pain, inflammation, pulmonary edema, cardiovascular dysfunction, and cardiac failure. In one study, two different species of jellyfish, Chironex fleckeri and Chrysaora quinquecirrha, were collected from different locations. The Chironex were collected from Queensland, Australia. Tentacles were then taken from each kind of jellyfish. The venom from the tentacles were examined for cytotoxicity. The definition of cytotoxicity is toxic