Let's see:
- Creating and Using Tools
There are degrees. Chimps use sticks to get termites, and I just saw a crow *bend* and use a piece of wire to accomplish a task. Other animals demonstrate crude tool use as well. Not on the level of chainsaws, cars or ocean-going vessels, but there are degrees.
- Developing Commerce, Trade and an Economy
Even among human societies this varies in degree. We don't see
*much* we recognize as trade between animals, but Bonobos use sex as a bartering tool.- Developing Mathematics and Language
Many creatures communicate to one degree or another. In somes cases, the communication seems fairly sophisticated. Nothing we recognize as math, yet, though.
- Having History, Liturature and Art
We don't see much we recognize as liturature or art. Perhaps nest building animals has a sense of art in their nest creations. There doesn't appear to be formal history, but animals do seem to pass on behaviors by example, if nothing else. Mother animals have been observered apparently training their young to hunt.
- Having Government and Law
We see signs of social behavior in many animals and clear heirarchies. These are the foundations of government and law.
- Abstract Thought (leads to math and art)
It *appears* animals lack this, but the question is open to some degree or other.
- Builds on the Work of Previous Generations
We have seen signs of tribes of animals learning new skills, which become part of their tribal culture from then on. We have even seen them pass those traits to neighbor tribes (perhaps by example rather than intention).
Obviously. (-:
The question, "What indicators might we use ...." does not have a yes/no answer. We can decide a given species appears to stand "generally here" on the intelligence continuum. Even humans don't stand in a *single* spot on that continuum, but are spread out.
Can you see that you don't understand what I'm saying?
Merriam-Webster.... Main Entry: sen·tient Pronunciation: 'sen(t)-sh(E-)&nt, 'sen-tE-&nt Function: adjective Etymology: Latin sentient-, sentiens, present participle of sentire to perceive, feel Date: 1632
1 : responsive to or conscious of sense impressions 2 : AWARE 3 : finely sensitive in perception or feeling- sen·tient·ly adverb
Nothing above suggests it isn't a continuum.
Utter BS. I prefer the company of animals to that of most humans.