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But in the 20th century, humans suppressed fires and forests became overgrown.

That they are so prevalent, that they have such a history, has kept them cloaked in an overgrown mystery for many of us.

Forests that had boasted hundreds of species were reduced to dried-out fragments, overgrown with invasive grasses.

Mr Combs was led into a wood-panelled courtroom on Friday in New York's southern district federal court wearing a greenish-tan prison jumpsuit, with overgrown grey hair and a beard.

"Remove potential nesting sites by keeping yards and gardens clean and tidy, and cut back overgrown areas," they added.