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In the 1950s, Crufts became an obedience championship show for the first time, and working sheepdogs were entered, becoming the first crossbreeds to compete.

This is a weaker attempt to crossbreed the classic Universal monsters with contemporary anxieties: a post-pandemic lockdown lament about the impossibility of protecting children from fear.

Mrs Justice Beverley Lang dismissed most of the legal challenge, saying there was "sufficient evidence of an alarmingly high level of fatal attacks" by XL bullies or XL bullies crossbreeds.

Bees in Southern California, originally from Europe, started crossbreeding with Africanized bees in the 1990s, said Orange County beekeeper Mike Henderson.

This evolutionary process leads to the formation of ecotypes, i.e., locally adapted "plant breeds" that differ slightly in appearance and may no longer be easily crossbred.