Naturalist and broadcaster David Bellamy has died aged 86, the Conservation Foundation has said.
In a statement, David Shreeve, director of the foundation, said: "Sadly, I have to report that David Bellamy died this morning.
"David and I worked together on a variety of projects in a various places since launching The Conservation Foundation in 1982," he said.
"He was a larger-than-life character who became a very special friend and teacher. He inspired a whole generation with his wide range of interests and enthusiasm which knew no bounds.
"The Conservation Foundation was very special to him and so today is very sad for all of us."
Bellamy was a household name as a TV personality, scientist and conservationist.
He inspired Sir Lenny Henry's "grapple me grapenuts" catchphrase and was a regular presence on TV.
Bellamy, who was born in London but lived in County Durham, later attracted criticism for dismissing global warming.