TL;DR

Researchers at the University of Sussex used AI to identify the call of a lesser spotted woodpecker in over 1,300 hours of field recordings — the first time the bird has been recorded in woodlands near East Grinstead in more than 30 years.

Finding a Needle in a Soundscape

The lesser spotted woodpecker is Britain’s rarest woodpecker, with an estimated 600 breeding pairs remaining. The birds have been in decline since the 1980s and sit on the UK red list of conservation concern. Their habit of staying high in the tree canopy, combined with their sparrow-like size, makes visual monitoring extremely difficult.

Dr James Whitehead and a team from the University of Sussex deployed 37 acoustic monitoring stations across Sussex, capturing recordings every 10 minutes throughout the year. Processing thousands of hours of audio manually would be impractical — this is where AI made the difference.

The AI system identified four instances of the lesser spotted woodpecker’s call, all from the William Robinson Gravetye Estate. Two recordings were captured during breeding season, which Whitehead said was “important” as it suggested a breeding pair was likely present.

The final confirmation still required human expertise. Members of the Sussex Ornithological Society — described by Whitehead as “woodpecker whizzes” — verified the AI’s findings.

Conservation Action

The discovery has already prompted practical conservation work. Laura Henderson, director of English Woodlands Forestry, which manages 167 hectares of woodland on the estate, said they would now manage the habitat to support the birds. This includes leaving “totems” — tall trunks of dead wood — when cutting diseased trees, providing the deadwood habitat that lesser spotted woodpeckers need for nesting.

Unlike their greater spotted cousins, the birds cannot bore through living bark to make nests, making dead and decaying wood essential for their survival.

Looking Forward

The project demonstrates how AI-powered acoustic monitoring can scale wildlife surveys far beyond what human observers can achieve alone. With recording continuing in 2026, the team hopes to detect more calls — and potentially confirm a breeding population. The approach has broader applications for monitoring other declining UK species.