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Iduna
Reed and tree warblers
genus of Acrocephalidae within Passeriformes

trivial name latin name name specimens
Western Olivaceous Warbler
Iduna opaca 		Iduna opaca 5 5
Olivaceous Warbler
Iduna pallida 		Iduna pallida 4 4
Booted Warbler
Iduna caligata 		Iduna caligata 1 1
Sykes's Warbler
Iduna rama 		Iduna rama 1 1

...

species comparison1)

1) According to Hartmann (2000a, 2000b and 2016)