Two residents were baffled to see a snake on the loose in Birstall on Tuesday.
Christine Redfearn and neighbour Catherine Squire spotted the California King Snake “sunbathing” next to a bush in Lees View about 12.15pm.
Ms Redfearn said: “I wanted to pick it up but she wouldn’t let me. It was a bit of a shock really.
She and Catherine called the RSPCA, who told her to ring the police - who then told her to contact the RSPCA.
Eventually, Ms Redfearn rang her granddaughter Courtney Brennan, who works at Morley Exotic Animal Rescue. She and a colleague collected it, and confirmed its name.
“It will stay up there for somebody to claim,” said Christine.
Anybody missing the animal should contact Morley Exotic Animal Rescue on 0113 253 1432.