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Background The taxonomy of the Collared Owlet (Glaucidium brodiei) species complex is confused owing to great individual variation in plumage colouration seemingly unrelated to their distribution. Although generally recognised as a single species, vocal differences among the subspecies have been noted by field recordists. However, there is no study assessing the vocal differences among these four...
Summary. An overview of taxa currently gathered under the ‘Monocera Group’ in West Malesia (here treated as comprising Peninsular Malaysia, Sumatra and Java) is offered. The widespread Elaeocarpus macrocerus (Turcz.) Merr. is distinguished from the superficially rather similar E. obtusus Blume, of rather similar distribution. E. achmadii Coode, from Simuelue Is., Sumatra, most similar to...
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