Inspector Tim Dixon, of the society said the young anglers who found the turtle - and nicknamed him Lucky - were lucky not to get bitten themselves.
"It could have easily taken one of their fingers off," he
said."These things do grow up to be quite aggressive."
With a shell diameter of 14ins, Mr Dixon
estimated Lucky was up to 20 years-old, and had probably lived most of his
life in the wild.
"People get bored with them, and because they're difficult to re-home, they just get released back into the wild - even though it's illegal," he
would have been a popular thing to have around about the time of the Mutant Ninja Turtles craze." He
added that Lucky would have found the pool, just north of Slacky Lane, an ideal habitat for feeding on small fish and ducklings.
"I'm presuming that because we've had quite a lot of heavy rain in the past couple of days, he
would have been more active," Mr Dixon
said although Lucky was the first common snapping turtle he'd ever picked up in Walsall, one or two usually surfaced across the wider region every year.