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He said the introduction of other species such as white-tailed sea eagles had led to "unintended consequences".

The most famous in the UK is probably the beaver or the white-tailed sea eagle - charismatic species that generally get people more excited than plants.

Specially-trained guardian dogs from the Alps could be used to help protect new born lambs from sea eagles.

Conservationists fear avian flu has damaged the breeding success of white-tailed sea eagles - the UK's largest bird of prey.

She said similar cases have been documented for other related species, including the case of a white-tailed sea eagle, which adopted a common buzzard.