Reasons for increase not clear but experts say it could be welcome sign marine ecosystem is becoming healthier
The Farne Islands off the Northumberland coast have long drawn fans of the natural world keen to catch sight of the resident guillemots and puffins.
But as recently as last week, another much bigger black-and-white animal has been delighting wildlife spotters. Orcas have been appearing more regularly than ever before.
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This article was originally published by The Guardian and written by Hannah Al-Othman North of England correspondent.
Read original article on The Guardian