Gustave was named by Patrice Faye, a French resident of Burundi and self-taught naturalist who has been pursuing the crocodile since 1998. Faye and a documentary team attempted to capture Gustave in 2002 using an enormous trap, but the crocodile not only avoided it, but seemed to taunt the team as well. The ill-fated attempt was detailed in a documentary titled Capturing the Killer Croc, which aired on PBS in May 2004.
Gustave was sighted most recently in February 2008 by National Geographic sources. In parts of Asia and Australia saltwater crocodiles (Crocodylus porosus) 6 metres (20 ft) long are well known and easy to spot; individuals 7 metres (23 ft) long have been reported. In eastern India the Guinness Book of World Records has confirmed the existence of a 7 metre individual. Therefore, Gustave is not exceptional in size compared to other species of crocodiles, although he is much larger than the average male Nile crocodile. He is known for the few distinct bullet scars that cover his body: one on his head and three on his right side.
Due to his colossal size and weight, he is virtually incapable of catching smaller prey like small mammals and fish, and so he hunts larger, heavier animals like wildebeest, humans, zebra and even hippo.
As of January 2009, Gustave still lives within the Ruzizi River area and is occasionally spotted by people, although no human fatalities have been officially attributed to him since his sudden notoriety.