Built like a gull on steroids, the bonxie is streaked brown with a huge, cruelly hooked bill.
But arching in behind them, with menace, was the unmistakable silhouette of a bonxie.
"Ladies and gentlemen, killer whales!" said our guide, dragging everyone's attention from the gorging bonxie to the vast, flat expanse of sea beyond the cliff edge.
Unst does make plenty of guest appearances in his current show, including an ode to the "
bonxies" or Great Skuas, which notoriously divebomb anyone who comes near their nests.
This year many
bonxies have turned cannibal and at most colonies, no young are expected to fledge.
Now we learn that Great Auks, the marauding Shetland bonxies, which used to feed on fish discarded at sea, are feeding instead on young puffins and guillemots because, with the shrinking of the fleet, there are so few discards any more.
Wouldn't it be ironic if the pleas of Scotland's fishermen at last got a hearing in Brussels not because the Commission are worried about fishermen's children being deprived, but because it can't bear the thought of starving bonxies gobbling up hapless puffins and guillemots.
Although identified as Great Skuas (
Bonxies), both these birds did not look quite right and provoked a lot of debate as to their identity.
Known locally as "
bonxies", they have little fear and kill other seabirds for their food.
Throughout this month observers have braved the worsening conditions to face into the wind and rain, and search for birds passing over the sea off Porthcawl and, although there aren't many, there are quality finds such as '
bonxies' - birders' favourite name for the great skua - and arctic skuas.
They had strayed off the paths and got too close to nesting sites used by Skuas - known locally as
bonxies - which have little fear.
The perilous fortunes of seabird populations in the far north has seen great skuas, or
bonxies, as one of the few species to thrive - but they have started feeding on a variety of species, rather than mobbing gulls to give up their food.
Great skuas,also often referred to as
Bonxies, their oldNorse namest ill used on Shetland where they breed,can tackle birds as big as gannets and have no fear attacking people that make the mistake of venturing to close to a nest.