Gustave was named by Patrice Faye, a herpetologist who has been studying and investigating him since the late 1990s. Much of what is known about Gustave stems from the film Capturing the Killer Croc, which aired in 2004 on PBS. The film documents a capture attempt and study on Gustave.
Description Since Gustave has not been captured, his exact length and weight is unknown, but in 2002 it was stated that he could be "easily more than 18 feet (5.5 m)" long, and weigh more than 2,000 pounds (910 kg). He was estimated to be around 100 years old in order to achieve such outstanding size; however, further more careful observation of Gustave revealed a complete set of teeth when he opened his mouth. Since a 100-year-old crocodile "should be nearly toothless" (according to the documentary), he was estimated to be "probably no older than 60, and likely, still growing". Gustave is also known for the three bullet scars on his body. His right shoulder blade was also found to be deeply wounded. Circumstances surrounding the four scars are unknown. Scientists and herpetologists who have studied Gustave claim that his uncommon size and weight impede his ability to hunt the species' usual, agile prey such as fish, antelope and zebra, forcing him to attack larger animals such as hippopotamus, large wildebeest and, to some extent, humans. According to a popular local warning, he is said to hunt and leave his victims' corpses uneaten. The documentary film also stated that since crocodiles can go several months without eating, Gustave could afford to select his prey carefully. In 2009 the croc had reappeared in Ruzizi River near Lake Tanganyika.
In real life, as seen in this film, an attempt to bait the crocodile failed. The team used a live goat as bait one night, and the team continued this for days. One day the goat disappeared. The camera failed the night before due to a storm, and then political issues in the area forced the team out of the country. Leaving them unable to know what happened that night.
Dominic Purcell's contract stated that he must at all times have three to four of buttons of his shirt unbuttoned at all times no matter what situation they were in.
The promotional trailer refers to Gustave in a manner one would refer to a human killer with juxtaposing quick edits showing he is obviously a crocodile, while the website openly states what he is.