We had another thread that wandered into this turf and after a bit animal rights became an issue.
With all due respect to animals and without infringing on any rights (I have a pet cat who is very fond of me and I of her), it might help to define what exactly 'intelligence' is in the strict sense.
I propose this definition: intelligence is the ability to think about something that itself cannot be reduced to a pure sensory impression or memory.
So dogs have an array of barks that indicate a threat from the air or ground. These barks stir up a sensory memory/impression of a threat - they switch on a certain part of the dog's memory or instinctive programming, which in turn provokes an appropriate response. This is not intelligence in the strict sense of the word.
A human writes on a piece of paper: "All generalisations are false, including this statement". He is conveying concepts that cannot be reduced to a pure sensory memory/impression. In other words, he is conveying a collection of abstract ideas, and with them an implicit irony, itself also an abstraction. This is intelligence.
Demonstrate that an animal is capable of communicating and understanding abstract ideas like this and you have intelligence in animals in the strict sense of the word. But thus far I have yet to come across any example of it.
One final point: animals of course are capable of intelligent behaviour, sometimes very intelligent behaviour, like weaver birds building their intricate nests or beavers a dam or ants an anthill, but does that mean they are intelligent? Did a bunch of weaver birds gather around a stretch of flat, sandy ground and sketch with a twig their blueprint for an ideal nest? Did they try different variations before hitting on the best formula? No they didn't. They are programmed to build a nest in a certain way and in no other, and they are incapable of varying or improving their nest design according to circumstances or taste - which would be a sign of true intelligence.
With all due respect to animals and without infringing on any rights (I have a pet cat who is very fond of me and I of her), it might help to define what exactly 'intelligence' is in the strict sense.
I propose this definition: intelligence is the ability to think about something that itself cannot be reduced to a pure sensory impression or memory.
So dogs have an array of barks that indicate a threat from the air or ground. These barks stir up a sensory memory/impression of a threat - they switch on a certain part of the dog's memory or instinctive programming, which in turn provokes an appropriate response. This is not intelligence in the strict sense of the word.
A human writes on a piece of paper: "All generalisations are false, including this statement". He is conveying concepts that cannot be reduced to a pure sensory memory/impression. In other words, he is conveying a collection of abstract ideas, and with them an implicit irony, itself also an abstraction. This is intelligence.
Demonstrate that an animal is capable of communicating and understanding abstract ideas like this and you have intelligence in animals in the strict sense of the word. But thus far I have yet to come across any example of it.
One final point: animals of course are capable of intelligent behaviour, sometimes very intelligent behaviour, like weaver birds building their intricate nests or beavers a dam or ants an anthill, but does that mean they are intelligent? Did a bunch of weaver birds gather around a stretch of flat, sandy ground and sketch with a twig their blueprint for an ideal nest? Did they try different variations before hitting on the best formula? No they didn't. They are programmed to build a nest in a certain way and in no other, and they are incapable of varying or improving their nest design according to circumstances or taste - which would be a sign of true intelligence.