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Knysna Warbler

Bradypterus sylvaticus

The Knysna warbler, or Bradypterus sylvaticus, presents a modest palette of browns with an olivaceous hue gracing its upperparts, inclusive of wings and tail. The underparts are a lighter olivaceous brown, transitioning to a whitish belly center. Its chin and throat bear a similar olivaceous brown, albeit mottled with white and finely streaked. A relatively short and square tail complements its discreet profile, while its eyes, bill, legs, and feet are uniformly brown, save for the lower mandible's paler, horn-like coloration.

Identification Tips

To identify this elusive bird, look for the subtle olivaceous tinge on its upperparts and the paler hues below. The mottled throat and fine streaks, along with the short, square tail, are key features. The brown eye, bill, and limbs contrast with the paler lower mandible.

Habitat

The Knysna warbler inhabits the dense, tangled scrub on the fringes of forests, often in proximity to the coast. It has shown adaptability to non-native bramble thickets and has made a home in suburban riparian woodlands.

Distribution

This warbler is endemic to South Africa's coastal regions, specifically the southern Western Cape and Eastern Cape, with marginal presence in KwaZulu-Natal. However, it is now extinct near Durban due to habitat loss. Notably, a small population resides on the eastern slopes of Table Mountain in Cape Town, and it frequents forested valleys in the Langeberg. The species is recorded in approximately 24 nature reserves, including the Addo Elephant National Park.

Behaviour

The Knysna warbler is a ground-dweller, often found at the base of vegetation, making it quite challenging to spot. It is known to forage on the ground and can be coaxed into view with its distinctive 'tabirr' call or its fine, accelerating trilled song, though these vocalizations are used sparingly.

Song & Calls

The warbler's vocal repertoire includes a 'tabirr' call and an accelerating trilled song, which are essential for locating this typically unseen bird.

Breeding

Breeding territories are typically established in dense vegetation near streams, with nests placed close to the ground. The species exhibits high philopatry, as evidenced by a color-ringed nestling later occupying its parent's territory. Some local migration may occur.

Similar Species

Northward, the Knysna warbler is replaced by Barratt's warbler, which can be distinguished by its longer tail, mottled throat, and unique call and song.

Conservation status

The Knysna warbler is currently classified as Vulnerable by the IUCN, with a small and potentially declining population due to both natural and artificial fragmentation of its habitat, coupled with limited dispersal and reproductive capabilities.

Knysna Warbler Sounds

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Recorded by: © 
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