Well, in first of all admitting that 1. I wasn't there yesterday, 2. have never been to Banham zoo, 3. have no connection with Banham zoo, and 4. am not qualified in animal psychology I have read all preceding posts with care and would like to offer an another suggestion.
Boredom is a human state of mind and I wonder how appropriate it is to anthropomor... whatever the word is for attaching human behavioural characteristics to animals?
Is the monkey/ape in photo 1 bored or resting? Is it perhaps curious about all those long pokey tubular things which the humans are holding up to their faces and pointing in his/her direction?
Photo 2 is super but the primate to which it belongs could be doing absolutely anything at all out of shot. It shows a paw holding onto to a cage.
Big cats and a well-worn path around the perimeter fence. In the wild, animals tend to develop paths which they use and re-use over time. Rabbits do it, badgers do it, rats do it, foxes, deer, sheep and cattle do it. The perimeter fence represents the boundary of the big cats' territory and the worn path might represent nothing more than the cats going as far as they can. Or seeing how close they can get to fresh meat on legs.
I don't know how many hectares represents the natural territory of a big cat but if they had this amount of space, with natural vegetation and cover, and without using feeding stations to draw them closer to the visiting humans, I wonder how much of them you'd actually see?
How many animals in their natural environment divide their time between sleeping, reproducing and eating and when not doing one of these three simply conserve energy?
Is there a reptile house or an aquarium at Banham zoo and, if so, how did the inhabitants look? Excited? Bored?
Those of you with a dog will know how much time your pet spends flat on its back fast asleep. Does that imply boredom?
There has been the occasional thread here about street scene candid photography and how you'd feel if you came across a car crash - would you take photos or wouldn't you? Surely the same ethical consideration applies at a zoo: if you're uneasy about taking the photo you simply walk away?
How many of the animals at Banham zoo have been bred in captivity and know no other environment?
There. I don't expect everyone to like my post but I simply offer, as part of this interesting discussion, a different point of view.
Oh, and by the way, what crummy weather you had yesterday!
And, I have nothing against any ot the TP members involved - lovely people one and all. So I am not having a pop at anyone.