Hard Coral
Close up of Great Star Coral (Montastrea cavernosa) with its polyps out.
Permission to use this image granted with credit to the photographer.
Taken in the Sian Ka'an Biosphere Reserve, Mexico.
Links:
[1] http://www.coral.org/_48
[2] http://www.coral.org/_51
[3] http://www.coral.org/_48
[4] http://www.coral.org/_49
[5] http://www.coral.org/_50
[6] http://www.coral.org/_51
[7] http://www.coral.org/_54
[8] http://www.coral.org/_55
[9] http://www.coral.org/_56
[10] http://www.coral.org/_57
[11] http://www.coral.org/_54
[12] http://www.coral.org/node/4120
[13] http://www.coral.org/_53%3Fsize%3D_original