The Most Astounding Transparent Animals: Barreleye Fish
The first photos of this strange fish alive and in its natural habitat were not published until 2004, although the species has been recognized since 1939. Found in the Atlantic, Pacific and Indian Oceans at a depth of between 600 to 800 meters, there are 14 different types of Barrelfish. Their most salient feature? Their weird eyes and their completely transparent head.
In the wild Zebrafish grow up to be striped and opaque, but researchers at Children’s Hospital Boston have bread specimens that stay transparent their whole life. Used in cancer research, amongst other things, these clear Zebrafish allow scientists see what’s going on inside without dissection.