Professor Rory Putman and deer expert Niall Rowantree discuss Scotland's next big deer problem: sika. The Scottish government has successfully wiped out large numbers of iconic Scottish red deer. In their place are coming a new, invasive species, Japanese sika. More a horde than a herd, our experts expect they will be Scotland's number one deer within a few years.

For Niall's website, visit Deerman.co.uk

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