Gregg M said:
The Srtess they do feel is not a mental stress like we feel.... It is a stress on their physical being that cause them to have problems......
Actually, being a long-term sufferer of stress-related illness myself... humans don't feel 'mental' stress. Stress in any animal including humans has major physical components - whether it be nausea, reduced immunity, loss of weight, increased hunger or physical aches and pains. The physical effects, in turn, can cause mental distress and discomfort - and vice versa.
We as humans are just more aware of WHAT causes us the stress and we are ALSO often put into situations that induce unnatural levels of -prolonged- stress. A wild zebra does not feel stress often enough or long enough in duration to cause ulcers, for example - if the zebra is stressed, it is typically because it is starving, dehydrating, being attacked by a conspecific or being attacked by a predator. All of those things either lead to resolution (Finding food, finding water, moving away from the attacker) or death (Dying of dehydration or starvation, being killed by the other animal.)
Humans, on the other hand (and the animals who share our homes)... the things that cause us stress are often long-term problems. Things that we cannot fight or run away from. And so, humans have much more emotional distress shown with the physical effects of stress - and more physical effects, because the stressors are constant rather than intermittent.
Short bursts of stress have even been shown to be beneficial to animals including humans... but long-term stress is debilitating.
I'd argue that my geckos are capable of the following:
Distinguishing between individuals of the household and individuals who are visitors and reacting with fear to the latter.
Expressing reactions to sudden stressors - typically fear responses.
Expressing contentment in certain locations or temperatures.
Expressing a desire to be 'out on people' instead of 'in vivarium' - my males do NOT scratch on the viv door if I'm not sat at my computer.
Expressing something particularly reminescent of curiosity - investigation of new things without fear.
That indicates that, though they might not have as much going on in those little heads as my cats or my dog or my parrot... they're not totally unaware little biological machines, either.
Conversely, it's pretty obvious that a dog who wants to be with her pack 'loves' her pack members in the same way that children 'love' their parents - they have a sense of need-to-be-with-them. A cat who treats you like its mother - kneading, purring, and particularly bumping you with his forehead - is making a similar statement of 'I need to be with you', even if you do not have the capability to nurse them. And our parrot... she's another thing entirely. She's got more going on in her peanut-sized brain than any of our other animals put together. Knowledge of self, knowledge of others, knowledge of difference and similarity... all well within an African Grey's scope. And the ability to articulate it in the language of her flock, no less.
- Ssthist