They say we share 97% of our DNA with orangutans, whenever I visit these creatures I become more and more certain they are as sentient as we are. From watching the young playing by rolling head over heel in the grass much the same way as my own children did. Of most animals apart from humans their children stay with their parents for the longest periods of time, normally six years or so.
Then you get moment like this, when a mother come up to the glass to observe the human animals looking back at her. She look at you straight in the eye, not looking away but holding your gaze and you just know there has been an acknowledgment, a connection between species.
She knows the human animal and she knows what it is capable, its a pity the human animal does not seem capable of her level of understanding.