In conservation, absence is often the first sign of trouble. A bird not seen for years may still persist in some overlooked corner of its range. Or it may already be gone. The “lost birds” list was created for this gap, marking species that have slipped from view but not yet into extinction.
The latest update shows some progress, reports Spoorthy Raman. Five bird species long missing were documented in 2025, all on islands in Southeast Asia and Oceania. Another was recorded soon after in Chad, after 94 years without a confirmed sighting. These rediscoveries have reduced the number of “lost” birds to 120, down from 163 when the list was first compiled.
The list is maintained by the Search for Lost Birds project, a collaboration between conservation groups. It does not replace formal assessments such as those of the IUCN Red List. It acts earlier. Species can disappear from observation well before they are formally classified as threatened. The list prompts renewed searches, before options narrow.
Much of the work now depends on birders and local observers. Researchers review records from platforms such as the Cornell Lab of Ornithology’s eBird and iNaturalist, where sightings, photographs and recordings are uploaded. Rediscoveries often come from these contributions rather than targeted expeditions.
Some changes are less encouraging. A few species are removed not because they have been found, but because they are no longer believed to exist. In 2025, the slender-billed curlew was declared extinct, decades after it was last recorded. In other cases, advances in genetic analysis have led to reclassification, narrowing what counts as a distinct species.
New additions show where risks are most acute. The six species added in 2026 are all island endemics. Their ranges are small, and pressures are concentrated. Habitat loss remains the main cause, with added pressure from invasive species, hunting and climate change. On islands, there are few refuges.
There are some grounds for optimism. The number of lost birds has fallen by about a quarter in five years. The decline suggests the list is having an effect. It draws attention and leads to searches. Still, rediscovery is not recovery. A photographed bird is evidence of survival, not security. Finding a bird is only the start.
Full story: Once lost, now found: Five “missing” bird species rediscovered in 2025, offering hope
