(via 500px / Show me your teeth by Alfons van Bokhorst)
photo by Lukas Koscelniak
George by Simplicity of Life
Photographed by Watch-Battery

Photographed by Watch-Battery

Submitted by watercolorwaffles.

Submitted by watercolorwaffles.

An endangered western female hoolock gibbon seen within her enclosure in Assam, India. Populations of the western hoolock gibbons have declined by almost 90% over the last 30 years, and it is now considered to be one of the most endangered 25 primate speies in the world. Picture: BARCROFT MEDIA

An endangered western female hoolock gibbon seen within her enclosure in Assam, India. Populations of the western hoolock gibbons have declined by almost 90% over the last 30 years, and it is now considered to be one of the most endangered 25 primate speies in the world. Picture: BARCROFT MEDIA

Hayley

Hayley

Pacific white-sided dolphin 
Vancouver Aquarium - April 2013; photographer: Jim H./Greyloch

Pacific white-sided dolphin

Vancouver Aquarium - April 2013; photographer: Jim H./Greyloch

Leopard waking up at the Antwerp Zoo (by cestlavieparis)

Leopard waking up at the Antwerp Zoo (by cestlavieparis)

by: Andi Gebhardt 
by: artis-musicus
by: angellachung
Photo by Karla Vidal

Photo by Karla Vidal


Taken by Curadopordeus at the Diergaarde Blijdorp Zoo, Rotterdam, The Netherlands.

Taken by Curadopordeus at the Diergaarde Blijdorp Zoo, Rotterdam, The Netherlands.

Hamadryas baboons at the Emmen Zoo in Emmen, Netherlands, have been behaving strangely. They have not been eating and are sitting close together in a small periferic area of their island. A few years back the same group of baboons showed similar unexplicable behavior of mass apathy.  Picture: Vincent Jannink/AFP/Getty Images

Hamadryas baboons at the Emmen Zoo in Emmen, Netherlands, have been behaving strangely. They have not been eating and are sitting close together in a small periferic area of their island. A few years back the same group of baboons showed similar unexplicable behavior of mass apathy.  Picture: Vincent Jannink/AFP/Getty Images