These Tiny Birds Became Giants on Remote Scottish Islands

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Study finds Scottish island wrens became larger, genetically distinct, and increasingly separate from mainland populations.

The Birds Are Eurasian Wrens

Scientists Used More Than Body Size

St Kilda Wrens Became Dramatically Heavier

Shetland Also Produced Island Giants

The Two Giant Populations Evolved Separately

Their DNA Followed Different Routes

Their Songs Changed Alongside Their Bodies

Not Every Island Produced the Same Result

The Exact Cause Remains Uncertain

New Species Could Eventually Emerge

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Wrens are among Britain’s smallest birds, but populations living on several remote Scottish islands have followed a remarkably different evolutionary path. New research led by the University of Birmingham found that some have become substantially heavier, genetically distinct and noticeably different in appearance and song.

They are still tiny compared with most birds, so “giants” is relative rather than literal. Yet the transformation is extreme enough to rank among the strongest known examples of island gigantism in birds—and researchers believe some populations may be moving towards becoming separate species.

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