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Biology

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Essentially a nocturnal bird of secretive habits that are little understood, with much inferred from vocalisation patterns. Vocalisation begins at dusk but the bird does not leave its roost to feed until darkness falls. During the first two hours of darkness the owl hunts in the undergrowth for beetles and moths, exploiting this time when there is no competition from other nocturnal birds, later moving to higher levels for the same prey. Vocal activity peaks again before dawn. Roosting near the ground, mated pairs appear to maintain territories year-round, and roost either together or apart (2) (6).
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Conservation

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The Serendib scops-owl is found in five protected areas, each administered as a Forest Reserve or a Proposed Reserve by the Forest Department of Sri Lanka (2). However, further population surveys are required to better understand the abundance and distribution of this species, which for so long managed to elude detection in its forest home. Such studies would help guide effective conservation measures in the future to ensure that this mysterious owl, whose incredible discovery is a testament to one man's perseverance and dedication, is never lost again.
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Description

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The astonishing discovery of this tiny owl in 2001 in the southern rain forests of Sri Lanka stunned biologists around the world, representing the first new bird species to be identified in the country since 1868 (3). Ornithologist Deepal Warakagoda initially located the Serendib scops-owl in 1995 by its unfamiliar call, but it took a further six years of tracking this elusive and mysterious bird to eventually sight and photograph it. Thus, in 2001 it was confirmed that the owl appeared strikingly different from any other on the island or, indeed, anywhere in South Asia (4). This owl is small, short-tailed, uniformly reddish-brown, with eye-colour ranging from yellow to orange, but more orange in males (2). The bird lacks apparent ear-tufts present in most other species of scops-owl (Otus), its facial disc is only weekly defined, and only the very top parts of the lower leg are feathered (2). The owl roosts near the ground, where its colouration, size and shape camouflage it well amongst the dry and dead leaves (3).
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Habitat

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Found in large tracts of lowland rainforest, within an altitudinal range of 30 to 530 metres (2).
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Range

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Endemic to Sri Lanka, found thus far only in the southwest quarter of the island (2) at Kitulgala, Kanneliya and Eratna-Gilimale Reserves, with its strongholds in the Sinharaja and Morapitiya-Runakanda reserves, which are contiguous (3).
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Status

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Classified as Endangered (EN) on the IUCN Red List (1).
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Threats

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By the end of January 2006, about 80 Serendib scops-owls were known to exist (6). Since the species has such a small population, and restricted range of just 230 square kilometres, the owl has been officially classified on the IUCN Red List as Endangered (2) (5). These are both declining due to habitat loss and degradation (3).
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Serendib scops owl

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The Serendib scops owl (Otus thilohoffmanni) is the most recently discovered bird of Sri Lanka. It was originally located by its unfamiliar poo-ooo call in the Kitulgala rainforest by prominent Sri Lankan ornithologist Deepal Warakagoda. Six years later, it was finally seen by him on 23 January 2001 in Sinharaja, and formally described as a species new to science in 2004.[3] Apart from Sinharaja and Kitulgala, it has also been found at Runakanda Reserve in Morapitiya and Eratna Gilimale. It is known as පඩුවන් බස්සා in Sinhala.

It is the first new bird to be discovered in Sri Lanka since 1868, when the Sri Lanka whistling thrush—then Ceylon whistling thrush—(Myophonus blighi) was discovered. It is also the 24th (according to some authorities the 27th) endemic bird species for Sri Lanka.

The habitat of the Serendib scops owl is in the southern rainforests of Sri Lanka. There is an altitudinal range from 30 to 50 metres. This owl has no competition from other nocturnal birds, as the territories are completely different. This species has a very small population: at the end of January 2006 only 80 of them were known to exist.[4] The places that it is expected to be found are in five protected areas, like the Forest Reserve or the Proposed Reserve of Sri Lanka. They seem to be declining because of the loss of habitat and the degradation. The first two hours of darkness are when the owl hunts for its food.

This rare species inhabits the rainforests in the southwestern part of Sri Lanka. Like most owls, it is strictly nocturnal and hunts insects (e.g. beetles and moths) close to the ground. It begins calling at dusk, then its frequency rises again some two hours before dawn.

Unlike the other two species of scops owl in Sri Lanka, Indian scops owl (Otus bakkamoena) and oriental scops owl (Otus sunia), it does not have ear-tufts and its facial disc is only weakly defined. The general colour of this 16.5 cm (6.5 in) long, short-tailed owl is reddish-brown with paler underparts, spotted all over with fine black markings. The irides are tawny yellow (more orangish in male) and the feet are a pale fleshy colour. Tarsi are feathered for less than half their length. The claws and bill are a pale ivory colour.[5]

Taxonomic status

In 2006 and 2007, two papers were published by Sri Lankan ornithologists in the publication Loris questioning whether the Serendib scops owl was a distinct species from other scops owl species found in India, and if so, whether it was actually a new discovery or a rediscovery.[6][7]

The species has been subsequently recognized as a valid and distinct species by two of the authors who had earlier speculated on its “taxonomic uncertainty” in the papers mentioned above, in their following works.

  • Birds of Sri Lanka: A Tally List (2009) by C. D. Kaluthota and S. W. Kotagama.
  • An Illustrated Guide to the Birds of Sri Lanka (2010) by S. W. Kotagama and G. Ratnavira.

The question of ‘ear-tufts’ in this species, which has been misunderstood and led to questioning of its “taxonomic uncertainty” in the papers above, had already been dealt with at length in two articles at:

In culture

This bird appears on the 20 Sri Lankan rupee bank note (2010 series).[8]

References

  1. ^ BirdLife International (2016). "Otus thilohoffmanni". IUCN Red List of Threatened Species. 2016: e.T22732040A95041044. doi:10.2305/IUCN.UK.2016-3.RLTS.T22732040A95041044.en. Retrieved 11 November 2021.
  2. ^ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  3. ^ Warakagoda, Deepal H. & Rasmussen, Pamela C. (2004): A new species of scops owl from Sri Lanka. Bulletin of the British Ornithologists' Club 124(2): 85–105. PDF fulltext Archived 2014-02-07 at the Wayback Machine
  4. ^ "Arkive conservation". Archived from the original on 2010-11-19. Retrieved 2010-11-30.
  5. ^ "Arkive description". Archived from the original on 2010-11-19. Retrieved 2010-11-30.
  6. ^ Kotagama, S.W., De Silva, R.I. and Kaluthota, CD. 2006. "Taxonomic uncertainty of the new species of Scops-owl from Sri Lanka (Part 1)". Loris 24 (3 & 4): 21–23.
  7. ^ Kotagama, S.W., De Silva R.I. and Kaluthota, C.D. 2007. "Taxonomic uncertainty of the new Scops Owl from Sri Lanka - Part 2". Loris 24 (5 & 6): 48
  8. ^ "Central Bank of Sri Lanka". Archived from the original on 2017-08-03. Retrieved 2017-07-23.
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Serendib scops owl: Brief Summary

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The Serendib scops owl (Otus thilohoffmanni) is the most recently discovered bird of Sri Lanka. It was originally located by its unfamiliar poo-ooo call in the Kitulgala rainforest by prominent Sri Lankan ornithologist Deepal Warakagoda. Six years later, it was finally seen by him on 23 January 2001 in Sinharaja, and formally described as a species new to science in 2004. Apart from Sinharaja and Kitulgala, it has also been found at Runakanda Reserve in Morapitiya and Eratna Gilimale. It is known as පඩුවන් බස්සා in Sinhala.

It is the first new bird to be discovered in Sri Lanka since 1868, when the Sri Lanka whistling thrush—then Ceylon whistling thrush—(Myophonus blighi) was discovered. It is also the 24th (according to some authorities the 27th) endemic bird species for Sri Lanka.

The habitat of the Serendib scops owl is in the southern rainforests of Sri Lanka. There is an altitudinal range from 30 to 50 metres. This owl has no competition from other nocturnal birds, as the territories are completely different. This species has a very small population: at the end of January 2006 only 80 of them were known to exist. The places that it is expected to be found are in five protected areas, like the Forest Reserve or the Proposed Reserve of Sri Lanka. They seem to be declining because of the loss of habitat and the degradation. The first two hours of darkness are when the owl hunts for its food.

This rare species inhabits the rainforests in the southwestern part of Sri Lanka. Like most owls, it is strictly nocturnal and hunts insects (e.g. beetles and moths) close to the ground. It begins calling at dusk, then its frequency rises again some two hours before dawn.

Unlike the other two species of scops owl in Sri Lanka, Indian scops owl (Otus bakkamoena) and oriental scops owl (Otus sunia), it does not have ear-tufts and its facial disc is only weakly defined. The general colour of this 16.5 cm (6.5 in) long, short-tailed owl is reddish-brown with paler underparts, spotted all over with fine black markings. The irides are tawny yellow (more orangish in male) and the feet are a pale fleshy colour. Tarsi are feathered for less than half their length. The claws and bill are a pale ivory colour.

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