a.k.a. Dinosaur Cube
Described in patent of J. Holloway 2000, first manufactured in the mid 1990's,
left: custom made from a Rainbow Cube mechanism by D. Calvo 2007,
middle two: sold by SMAZ 2011,
right: sold by Mefferts 2011.
(all are plastic, left 2.3 inches, others 2.2 inches,
left three: yellow opposite orange, pink opposite red, blue opposite white
right: yellow opposite white, blue opposite green, red opposite orange)

Each corner can twist. Below are photos of the other three sides and of the puzzle mixed up:



The Dino Cube is one of the most easy (but fun) Rubik's type puzzles. Start by solving a corner and then do adjacent corners, working your way around to the opposite corner. It is not necessary to memorize move sequences. Three-deep reasoning may be needed, like "to rotate this triangle into place, I need to first rotate this corner so it doesn't get messed up (and then rotate it back afterwards), and before doing that I should rotate this other corner".

Further reading:
Jaap's Page, from: http://www.jaapsch.net/puzzles/dinocube.htm
Holloway Patent, from: www.uspto.gov - patent no. 6,056,290