In the countryside west of the Welsh capital, farmers have a WhatsApp group to warn of suspicious vehicles and some have barricaded the entrances to their fields with concrete blocks and fallen trees.
"They're watching us - which is probably the most disconcerting part about it," said Chris Edwards.
"We harvest the field and within hours, they're there."
He's seen gates "smashed off their hinges" and crops destroyed by trespassers illegally hunting hares with dogs. Neighbours have faced threats, "verbal and physical", when they've tried to intervene.
South Wales Police confirmed the Vale of Glamorgan was seeing an increase in hare coursing, and said the force was taking action.

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