As I mentioned in another thread, I think that the whole concept of intelligence or rather, the objective determination of animal intelligence is seriously flawed-and not just in regard to animals, but, as it was pointed out, even among us humans...
In terms of animal intelligence, I frankly see the human tester as the main problem. No matter how hard we try: it is nearly impossible for us humans to determine "intelligence" without falling for anthropocentrism in one way or another.
Let's be honest: we are highly social, competitive and inventive primates with relatively large, sulcated brains, full of neurons. We use especially our hands in various ways to manipulate our environment (including the fabrication of tools) and have developed complex versions of physical and vocal intraspecific communication. Alas, we remain playful, curious and "creative" even as adults, but also quite violent, emotional, malicious and thoughtless.
The more of these traits we see "reflected" in an animal (especially at first sight), and the better it behaves according to the tests we constructed (which are based on concepts highly regarded by us humans-such as use of tools, language, memory etc.), the quicker it learns and follows our training, and the more "human" it appears, the more likely we are to consider this animal as "intelligent". Consequently, we typically use the results from the tests to rank and value the animal according to its "intelligence", as we humans love to rank things and appretiate intelligence as a positive trait.
Due to this, domestic animals like dogs, pigs or horses as well as many primate species, but also ravens, parrots, elephants or dolphins are considered "intelligent"-wheras most reptiles, amphibians, fish, many birds and smaller mammals and especially most invertebretes (with the exception of some cephalopoda that did "well" in some tests...) are considered "less intelligent".
However, everyone who has ever owned a cat, a donkey or a dog breed known to be "headstrong" (may it be a dachshund, a terrier or a shiba inu) knows that not following commands or not acting up according to human will doesn't have to indicate an absence of "intelligence"-just as "stupid" animals like turtles, sheep/cows or coconut crabs can sometimes display behaviour that could be considered "intelligent"-yet just always according to our (current) human standards...
Personally, I don't think that high adaptivity and habitat generalism is compulsivly a sign of intelligence-if so, cockroaches would be way smarter than, say, specialists like Giant Pandas or Cheetahs...
One should also not forget that the determination of intelligence is highly influenced by the tests themselves. Therefore, a snail would have problems to come out as "intelligent" in a test designed by smart mammals for smart mammals...
So if we talk about animal intelligence, one should always add:
according to [current] human standards. And how "objective" these can be, is mockingly illustrated by this quote from the movie "
MIB": "
Human thought is so primitive it's looked upon as an infectious disease in some of the better galaxies."
