Checked content



  • Skull of a dolphin with sonic organs.
  • Selfmade with inkscape


Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
In some countries this may not be legally possible; if so:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

derivative works

Derivative works of this file:

The following pages on Schools Wikipedia link to this image (list may be incomplete):


Learn more about Schools Wikipedia

SOS Children has brought Wikipedia to the classroom. More than 2 million people benefit from the global charity work of SOS Children's Villages, and our work in 133 countries around the world is vital to ensuring a better future for vulnerable children. We have helped children in Africa for many years - you can help too...