my own source is the book i am currently reading about legendary zoologist and snake expert Raymond Ditmars - famous for both his discovery/work with bushmasters and also his documentaries/books - got his start by keeping wild caught snakes that he found around his boyhood home at about age 12 (source: Bushmaster: Raymond Ditmars and the Hunt for the World’s Largest Viper by Dan Eatherley) - which of course leads me to believe that this history is probably much older than 40-50 years since Ditmars died before the end of WW2 in 1942