This article provides a summary of significant events in 1820 in birding and ornithology. Notable occurrences in 1820 include the first description of the yellow-legged tinamou, and the commencement of ornithologist William Swainson's Zoological Illustrations, a work including illustrations of many birds.

Events Heinrich Kuhl travels in Java collecting birds for the collections in LeidenRoberts TR (1993) "The freshwater fishes of Java, as observed by Kuhl and van Hasselt in 1820-23". Zoologische Verhandelingen 285: 1-94. PDF Heinrich Kuhl publishes . Bonn (also in Nova Acta Acad. Caes. Leop.-Carol. Nat. Cur. Vol.X). In this work he described many new parrot species. Among them are the red-capped parrot, the white-bellied parrot the Un-cape parrot, the vulturine parrot the short-tailed parrot the western rosella the blue-winged parrot the scaly-breasted lorikeet the scaly-headed parrot the golden-tailed parrotlet the northern rosella the black-collared lovebird and the vinaceous-breasted amazon Louis Pierre Vieillot undertakes the continuation of , commenced by Pierre Joseph Bonnaterre in 1790 Prince Maximilian of Wied-Neuwied describes the yellow-legged tinamouCOSTA CORRÊA L, Silva D, Cappellari L (2016) Aves, Tinamidae, Crypturellus noctivagus noctivagus (Wied, 1820): Southward range extension and rediscovery in Rio Grande do Sul, Brazil. Check List 6(4): 585-586. https://doi.org/10.15560/6.4.585 Leach's storm petrel named after William Elford Leach by Coenraad Jacob Temminck without Temminck being aware that it had previously been described by Vieillot Short-toed treecreeper named by Christian Ludwig Brehm William Swainson commences Zoological Illustrations (1820–23)William Swainson: naturalist, author and illustrator by David M Knight. Archives of Natural History (1986) 13:275–290 Coenraad Jacob Temminck commences . New species described in this work in 1820 include the rufous-vented ground cuckoo, the cinereous antshrike, the northern white-faced owl, the olivaceous flatbill, the streaky-breasted honeyeater, Verreaux's eagle-owl and the Timor blue flycatcher Rijksmuseum van Natuurlijke Historie establishedL.B. Holthuis, Leiden, 1995; 1820 - 1958 : Rijksmuseum van Natuurlijke Historie; 172 p. PDF

Deaths 19 June - Joseph Banks (born 1743) 9 August - Anders Sparrman (born 1748)

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