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- © Brehm, Alfred Edmund; Pechuel-Loesche, Eduard - Brehms Tierleben. Allgemeine Kunde des Tierreichs. Niedere Tiere. (1893)
- Copyright licence: CC-BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/)
- Provenance: http://media.eol.org/content/2013/12/10/05/23208_orig.jpg