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File:Phoenix canariensis destroyed by Rhynchophorus ferrugineus 4.JPG

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English: Leaf bases of a Canary Island date palm, Phoenix canariensis, with burrows of the red palm weevil, Rhynchophorus ferrugineus, and with pupal cases collected from the burrows. Near Alistro, Corsica, 30 Dec 2012. The coin is a one Euro coin, diameter 23.25 mm
Deutsch: Basen von Palmwedeln einer Kanarischen Dattelpalme, Phoenix canariensis, mit Fraßgängen des Roten Palmenrüsslers, Rhynchophorus ferrugineus, und mit Puppenwiegen, die aus den Gängen gesammelt wurden und einer Euromünze, Durchmesser 23, 25mm. Nahe Alistro, Korsika, 30 Dez 2012.
Français : Feuilles du dattier des Canaries (Phoenix canariensis) fortement attaqué par le charançon rouge des palmiers (Rhynchophorus ferrugineus): Dans les trous des larves se trouvent aussi des loges de nymphose. En comparaisent, une pièce d'un Euro, diamètre de 23,25 mm. Près d'Alistro, Corse, 30 Déc 2012.
Date
Source Own work
Author Küchenkraut
This image has currency in it to indicate scale.

Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted.

Ideally, a photograph should include a ruler with the subject (example) or an added scale marking. SI ("metric") units are the most commonly used worldwide (see meter and centimeter).

Images with coins to indicate scale

Common coin diameters for reference:

  • U.S. dollar (as of?):
    • 1¢: 19.05 mm, 0.75 in
    • 5¢: 21.21 mm, 0.84 in
    • 10¢: 17.91 mm, 0.71 in
    • 25¢: 24.26 mm, 0.94 in
    • 50¢: 30.61 mm, 1.22 in
    • $1: 26.5 mm, 1.02 in
  • Canadian dollar (as of?):
    • 1¢: 19.05 mm, 0.75 in
    • 5¢: 21.2 mm, 0.83 in
    • 10¢: 18.03 mm, 0.71 in
    • 25¢: 23.88 mm, 0.94 in
    • 50¢: 27.13 mm, 1.07 in
    • $1: 26.5 mm, 1.02 in
    • $2: 28 mm, 1.1 in
  • Pound sterling as of 2021:
    • 1p: 20.32 mm, 0.8 in
    • 2p: 25.91 mm, 1.02 in
    • 5p: 18 mm, 0.71 in
    • 10p: 24.5 mm, 0.96 in
    • 20p: 21.4 mm, 0.84 in
    • 50p: 27.3 mm, 1.07 in
    • £1: 23.03–23.43 mm, 0.91–0.92 in
    • £2: 28.4 mm, 1.12 in
  • Euro as of 2002:
    • 1c: 16.25 mm, 0.64 in
    • 2c: 18.75 mm, 0.74 in
    • 5c: 21.25 mm, 0.84 in
    • 10c: 19.75 mm, 0.78 in
    • 20c: 22.25 mm, 0.88 in
    • 50c: 24.25 mm, 0.95 in
    • €1: 23.25 mm, 0.92 in
    • €2: 25.75 mm, 1.01 in

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