描述PloverCrocodileSymbiosis.jpg	English: A small bird such as a plover or sandpiper, representing the Trochilus described by Herodotus, eats leeches from the gaping open mouth of a Nile crocodile in an early example of Cleaning Symbiosis.
日期	1909年
来源	http://www.50birds.com/gendalligators2.htm, image taken from Popular Natural History, 1909
作者	Henry Scherren
授权 (二次使用本文件)	PD-Old-100 and PD-1923; Scherren died in 1911 so copyright has expired.
其他版本	本檔案有一個提取出的圖像：​PloverCrocodileSymbiosis (cropped).jpg。

A 'Trochilus' bird, perhaps a Sandpiper or Plover, Spur-winged Plover eats leeches from from the teeth of a Nile Crocodile, in a classic supposed example of cleaning symbiosis.

Egyptian Plover (Pluvianus aegyptius). Africa's Spur-winged Plover Vanellus spinosus is a lapwing and has black head with bold white triangle opening towards neck. P. aegypticus is a courser with a black head with two thin white stripes as here. The behaviour is apparently real, but not well documented. Dysmorodrepanis 21:35, 4 April 2008 (UTC)

Whatever the portrayed bird is meant to be, it is neither a Spur-winged plover (for instance black belly) nor an Egyptian plover (for instance black hindneck). The African bird it most resembles is the White-crowned/headed plover/lapwing (Vanellus albiceps). I guess the illustrator/author was not too familiar with African birds.

I wonder. The behaviour has been recorded among Sandpipers in Egypt, and the bird drawn is not unlike the Common Sandpiper (Actitis hypoleucos) (which overwinters in Egypt), so perhaps the artist used that as the model. Chiswick Chap (talk) 11:01, 17 February 2012 (UTC)

A footnote: there is little evidence for cleaning symbiosis between any bird and the Nile Crocodile, but what there is suggests that Herodotus and Scherren most likely heard about sandpipers; and Scherren clearly picked a sandpiper as his model for this illustration. Chiswick Chap (talk) 09:28, 4 November 2012 (UTC)

Illustration from Popular Natural History by Henry Scherren, published 1909. Image found at [:http://www.50birds.com/gendalligators2.htm].

	本作品在其来源国以及其他著作权期限是作者逝世后100年或以下的国家和地区属于公有领域。 这个作品在美利坚合众国属于公有领域，因为它首次发布早于1930年1月1日，或于该日期之前在美国著作权局登记。
本文件已被确认为免除已知的著作权法限制（包括所有相关权利）。

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