Image:Nps KanabAmbersnail.jpg

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Nps_KanabAmbersnail.jpg‎ (188 × 292 pixel, file size: 23 KB, MIME type: image/jpeg)

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This image has a coin in it to indicate scale.

Do not use object such as coins for scale, as they 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 are particularly bad as they can reinforce a geographical bias.

Please photograph an object such as a ruler or add a scale marking in via an image editor instead. SI/metric units are the most commonly used worldwide (see metre, 1 E-2 m).

Examples of good practice: with (metric & imperial) ruler and with superimposed line.
Examples of bad practice: here.

Common coin diameters for reference:

U.S. and Canada:
- 1¢: 19 mm, 0.75 in;
- 5¢: 20 mm, 0.79 in;
- 10¢: 18 mm, 0.71 in;
- 25¢: 24 mm, 0.95 in;
- 50¢: 30 mm, 1.18 in;
- $1: 26 mm, 1.02 in;
- $2: 28 mm, 1.10 in.

UK
- 1p: 20.32 mm, 0.80 in;
- 2p: 25.91 mm, 1.02 in;
- 5p: 18.00 mm, 0.71 in;
- 10p: 24.50 mm, 0.96 in;
- 20p: 21.40 mm, 0.84 in;
- 50p: 27.30 mm, 1.07 in;
- £1: 22.50 mm, 0.89 in;
- £2: 28.40 mm, 1.12 in.

Eur
- 1¢: 16.25 mm,
- 2¢: 18.75 mm,
- 5¢: 21.25 mm,
- 10¢: 19.75 mm,
- 20¢: 22.25 mm,
- 50¢: 24.25 mm,
- 1€: 23.25 mm,
- 2€: 25.75 mm,

[edit] Summary

By the National Parks Service.

Kanab Ambersnail, R. Averill-Murray AZ Game & Fish

Shown beside a dime (10¢ coin). Coin diameter: 18 mm, 0.71 in.

http://www.nps.gov/archive/grca/pphtml/highlights91.html http://www.gf.state.az.us/w_c/nongame_kanab_ambersnail.shtml

[edit] Licensing

This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright.

Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision.