The interesting thing about Bugun Liocichla is that the area immediately surrounding its known range has been extremely well-covered by competent birders every year for more than a decade, and it is still only known from a few territories in a tiny area.Nihoa Finch and Millerbird are endemic to a 0.69km2 island, smaller than Raso Lark 5.76km2
Both Zino and Bugio petrels have breeding ranges visible from one spot (actually, on a clear day, both are visible from one spot). However part of the population is dispersed on sea at any one time.
Bugun Liocichla may be more widespread, because it lives on extremely steep slopes in a roadless region, most of which was never explored by ornithologists. This is also the reason why it remained unknown for so long.
This question could be quite easily answered if Birdlife website could be searched as a database by all possible values (area of occupancy).
Bare-headed Bulbul, Sooty Babbler, Cambodian Tailorbird, Cambodian Laughingthrush?So what species has the smallest known range? Two categories, island endemics and continental species. I think Bugun Liocichla must be a good candidate for a continental bird, and I'll open the biddling for insular forms with Razo Lark.
These days, anything critically endangered. So (e.g.) Stresemann's BristlefrontBare-headed Bulbul, Sooty Babbler, Cambodian Tailorbird, Cambodian Laughingthrush?
Island birds, Bali Mynah.
On the owlet, how well is the distribution known? [see also Serendib Scops]Araripe Manakin must have a pretty small range for a mainland bird. And Long-whiskered Owlet.
Duncan is right, the immediate vicinity with similar habitat (similar species present) has been extremely well covered, year-after-year by competent field birders. I've birded several spots in western Arunachal Pradesh with seemingly similar habitat and correct elevation but without a sign, despite a concerted effort to search for it using playback, and paying attention to Rusty-fronted Barwing flocks. A few years back there was a fairly large, widespread survey involving many birders/researchers with no sightings.This is explainable. Bugun Liocichla inhabits steep mid-mountain slopes with bushes or bushy understory of loose forest. This area of Arunuchal Pradesh is extremely steep, all towering mountains with 60-80o steep slopes and really no flat area at all. Only in few places one can build a dirt road or even a footpath. These few roads are open both for ornithologists and local people, whose cattle eats the bushes. So the ornithologists have only access to degraded habitat. There should be, however, pockets of bushes in all the inacessible places, which could be surveyed probably only by satelite monitoring or drones, or tedious alpine-type expeditions.
I presume this refers to the bird on Mt Kinabalu, if so, why the name change?Only Asian bird I can think of with a genuinely tiny range, similar to Raso Lark etc, not due to habitat loss or other human induced pressures would be Friendly Grasshopper Warbler.
James
Isn’t there evidence that Razo Lark was once found on other islands? Also Laysan Teal and Laysan Finch were not originally restricted to Laysan?Of course, "known range" is open to interpretation. I was mostly thinking about birds that have only ever been known from a very small area rather than birds that have been reduced to one in recent times thanks to human activity.
Having said that, it's still interesting to talk about birds like Mad Pochard, which is now confined to what is barely larger than a pond.
The first time I visited Sichuan, Grey-hooded Parrotbill was known only from the tiny summit Plateau of Emei Shan, a few hundred square metres, but has since been found at several additional localities.
Millerbird is found on two islands - Laysan and Nihoa.Nihoa Finch and Millerbird are endemic to a 0.69km2 island, smaller than Raso Lark 5.76km2
Both Zino and Bugio petrels have breeding ranges visible from one spot (actually, on a clear day, both are visible from one spot). However part of the population is dispersed on sea at any one time.
Bugun Liocichla may be more widespread, because it lives on extremely steep slopes in a roadless region, most of which was never explored by ornithologists. This is also the reason why it remained unknown for so long.
This question could be quite easily answered if Birdlife website could be searched as a database by all possible values (area of occupancy).
Don't get me wrong, I'm not arguing that the entire range of Bugun Liocichla is definitively restricted to what is currently known, and there is a good chance that new populations will be discovered, but it is surprising and perhaps worrying that this hasn't happened.I fell in love with East Himalayas when on a tour for the Bugun Liocichla. I cannot think there must be more avian gems, perhaps even more undiscovered species, hidden in those beautiful remote valleys.
@DMW - with the current model of tourism, there are indeed very many birds which are seen by 99% of birders at one and the same spot.