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Barred owls and spotted owls are similar in appearance and the birds can even interbreed.

"Over time we are going to have this entire lineage of cold adapted elephants that we can put back into the wild that can interbreed"

The two owls are closely related; they are similar in appearance and the birds can even interbreed.

Scotland's nature agency NatureScot refers to these animals as feral pigs, and said they include hybrids - a mix of boar and domestic pigs following interbreeding.

"Are they co-operative, is there interbreeding, are the locals able to make their way into the elite?"