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These biopesticides may be chemically similar to their synthetic descendents, but they’re generally weaker, target fewer species and don’t linger in the environment.

Voyce, a descendent of a 1920s England great of the same name, won his first England cap in 2001, but had fallen out of favour before his move to Wasps revitalised his international prospects.

Julie Summers, a descendent of Irvine, said in a statement that she was "moved to tears" when Mr Chin told her about the discovery.

All meant to terrify descendents with the wordless horror of blighted land and trigger the inexplicable rise of hairs on the backs of their neck.

In their announcement, the zoo said one of the incoming bears - Bao Li - is a descendent of that family.