1. 
   Countershading
   Countershading, or Thayer`s Law, is a form of camouflage. Countershading, in which an animal’s pigmentation is darker dorsally, is often thought to have an adaptive effect of reducing conspicuous shadows cast on the ventral region of an animal’s body. In essence the distribution of light on obj...
   Found op http://en.wikipedia.org/wiki/Countershading
   
   
2. 
   Countershading
   body colouration which is dark above and lighter below
   Found op http://australianmuseum.net.au/Glossary-of-fish-terms
   
   
3. 
   Countershading
   Condition of organisms in the water column that are dark-colored on top but light-colored on the bottom
   Found op http://life.bio.sunysb.edu/marinebio/glossary.c.html
   
   
4. 
   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 unillumi...
   Found op http://www.britannica.com/eb/a-z/c/150
   
   
5. 
   countershading
   1) Body colouration which is dark above and lighter below
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/countershading/1
   
   

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