https://upload.wikimedia.org/wikipedia/commons/3/3d/Frisian_Horse.JPG

https://pixabay.com/static/uploads/photo/2013/11/20/23/01/donkey-214246_960_720.jpg

https://pixabay.com/static/uploads/photo/2012/10/06/22/18/horse-60153_640.jpg


https://upload.wikimedia.org/wikipedia/commons/0/04/PoulainQuarterHorse.jpg


https://pixabay.com/static/uploads/photo/2014/04/05/11/40/pony-316672_960_720.jpg

https://pixabay.com/static/uploads/photo/2014/09/16/15/40/zebra-448361_640.jpg

https://www.google.ch/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwijytnrysTJAhUITBQKHX-QCeMQjRwIBw&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FHippopotamus&psig=AFQjCNHR_HeP4_BuoHW4ULIRL9TeGPgeeQ&ust=1449400204364730