The first idea for cloning came about in 1938 when Hans Spermann suggested an experiment where one would replace the nucleus of an egg with another cell and grow a new specimen from that. Cloning has now moved on from frogs and rabbits to sheep and dogs.
In the 50's, there were many attempts to clone frogs, and while the animals were cloned, they never made it past the tadpole stage and weren't deemed successful. In the mid 80's to early 90's, many embryos were cloned, such as rabbits, mice and sheep, and developed many cells but never grew to full animals. In 1995, two sheep, Morgan and Megan, were cloned from cell cultures. The first animal cloned from an adult cell was Dolly the sheep. After Dolly, in the late 90's and early 2000's there were many different kinds of animals cloned such as a mouse, a rhesus monkey, a buffalo, a cat and multiple dogs. In 2004, a group of Korean scientists claimed that they cloned a human embryo, but it was deemed a fraud. In 2009, the first extinct species, a Pyrenean ibex, was cloned. The animals lived for 7 minutes before it died from complications in lung formation.