Countershading

body colouration which is dark above and lighter below
Found on http://australianmuseum.net.au/Glossary-of-fish-terms

Countershading

Condition of organisms in the water column that are dark-colored on top but light-colored on the bottom
Found on http://life.bio.sunysb.edu/marinebio/glossary.c.html

countershading

(from the article `concealing coloration`) ...identity and location of an animal may be concealed through a coloration pattern that causes visual disruption because the pattern does not ... Another clue can lead to the recognition of an organism: its three-dimensional form, which causes the unilluminated portion of the body to be in ......
Found on http://www.britannica.com/eb/a-z/c/150

Countershading

Light underparts and dark upperparts of plumage disguise the outline of a bird, aiding in concealment.
Found on http://www.sialis.org/glossary.htm

Countershading

A color pattern, serving as camouflage, in which dark colors occur on the upper portion of the body and lighter colors occur on the underside.
Found on http://www.conservewildlifenj.org/glossary/

Countershading

Condition of organisms in the water column that are dark-colored on top but light-colored on the bot
Found on http://www.superglossary.com/Glossary/Science/Marine_Biology/
No exact match found