A report by the National Farmer's Union Cymru says that 'fly-grazing', where horses are left to graze on private land without permission, is a serious problem in Wales and that it's getting worse.
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The Plaid leader urged voters to give her party a mandate, so that she can give Wales a voice in Parliament as the SNP has for Scotland.
90,000 people are expected to attend the youth festival, which runs from the 29th May to the 3rd June.