Feeding Forebears

First established in 1960, founders of this [wildcat] population largely predate the onset of hybridisation in Scotland. The captive population now provides an important lifeline to reestablish this species in Britain.

https://theconversation.com/wildcats-lived-alongside-domestic-cats-for-2-000-years-but-only-started-interbreeding-60-years-ago-new-study-216871

Is an ‘onset’ something like an ‘ocelot’, I wonder?

Then I realise it’s “pre-date” not “predate”.