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Booted warbler

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Booted warbler
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Acrocephalidae
Genus: Iduna
Species:
I. caligata
Binomial name
Iduna caligata
(Lichtenstein, 1823)
Distribution of Booted Warbler
  Summer Resident (Breeding)
  Winter Visitor (Non-breeding)
Synonyms
  • Sylvia caligata Lichtenstein, 1823
  • Hippolais caligata (Lichtenstein, 1823)

The booted warbler (Iduna caligata) is a species of passerine bird belongong to the family Acrocephalidae, the reed and tree warblers. This species breeds in Eastern Europe and western Asia, wintering in south Asia. it is a regular vagrant to Western Europe.

Taxonomy

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The booted warbler was first formally described as Sylvia caligata by the German physician, explorer, botanist and zoologist Martin Hinrich Carl Lichtenstein with its type locality given as the Ilek River, near Orenburg. This species is now classified in the genus Iduna, the tree warblers, within the family Acrocephalidae.[1] All the "Old World warblers" were formerly classified within the wastebin taxon known as Sylviidae sensu lato but in the late 20th Century molecular studies resulted in this taxon being divided into a number of families.[2]

It was formerly considered to be conspecific with Sykes's warbler, but the two are now usually both afforded species status.[3]

Etymology

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The booted warbler belongs to the genus Iduna which was proposed by Alexander Keyserling and Johann Heinrich Blasiusin 1840 but they gave no explanation of the genus name , though in Norse mythology Iðunn, or Iduna, is the goddess of spring and fertility who was changed into a sparrow (or a nut) to enable her rescue by Loki.[4] The specific caligata is Latin for "booted" from caliga, "boot".[5]

Description

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The booted warbler is a small species of warbler, similar in size to a common chiffchaff. It has a nondescript plumage which is plain greyish brown on the upperparts and plaer on the underparts. There is a clear, pale supercilium and a shory bill with a dark tip. The jizz shown is of a short winged rather pot-bellied warbler with a square-tipped tail. This species and Sykes's warbler are challenging to identify.[6]

Distribution and habitat

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The booted warbler itself breeds from central Russia to western China, and migrates to winter in the Indian subcontinent as far south as Sri Lanka. Booted warbler has expanded its breeding range westward in recent decades and nests now as far west and north as Finland.[7]

This species is a regular vagrant to Western Europe with, for example, over 180 records in Great Britain up to 2023.[8]

Biology

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The booted warbler nests between May and early July, building a nest which is a well-built cup created from twigs, roots, stems and leaves, lined with feathers, animal hair and plant down. The nest is located on or close to the ground, or ata maximum height of 1 metre above the ground, hidden among dense undergrowth. It is mainly insectivorous.[7]

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References

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  1. ^ "Booted Warbler Iduna caligata (Lichtenstein, MHC 1823)". Avibase. Denis Lepage. Retrieved 23 April 2025.
  2. ^ Andreas J. Helbig; Ingrid Seibold (1999). "Molecular Phylogeny of Palearctic–African Acrocephalus and Hippolais Warblers (Aves: Sylviidae)". Molecular Phylogenetics and Evolution. 11 (2): 246–260. doi:10.1006/mpev.1998.0571. ISSN 1055-7903.
  3. ^ Silke Fregin; Martin Haase; Urban Olsson; Per Alström (2009). "Multi-locus phylogeny of the family Acrocephalidae (Aves: Passeriformes) – The traditional taxonomy overthrown". Molecular Phylogenetics and Evolution. 52 (3): 866–878. Bibcode:2009MolPE..52..866F. doi:10.1016/j.ympev.2009.04.006. PMID 19393746.
  4. ^ "Birds of the World - Comprehensive life histories for all bird species and families". 2024.
  5. ^ Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp. 84, 202. ISBN 978-1-4081-2501-4.
  6. ^ "Booted Warbler Iduna caligata". eBird.org. Cornell Lab of Ornithology. Retrieved 23 April 2025.
  7. ^ a b "Booted Warbler Iduna caligata". Birdlife Datazone. Birdlife International. Retrieved 23 April 2025.
  8. ^ Louise Bacon; et al. "Report on rare birds in Great Britain in 2022". British Birds. 116 (October 2023): 546–602.