It is because of their genes and their species. Some animals have smaller brains than others, there for, some have more abilities and are more curious. By being curious, the animal will be more experienced and be smarter.
Some animals mutate creating adaptations that make them more successful than other animals. through these adaptations natural selection weeds out the least adaptive to change and thus you have some animals more healthier, stronger and smarter than others.
No puppies are not twice smarter than a kitten they have the same level of smartness.Sometimes it depends on the puppy and the kitten cause some puppies and dogs are smarter than others.
1_cuz some people use their brain and some are sot 2_who have the to mutch number of the meanders in his brain is smarter than who have less
it depends on how well the horse is trained.
It dependens some people are smarter than others.
chimpanzees
I hate to say it, but most rabbits are very unintellegent. Some breeds are know to be smarter than others and individual animals vary, but you probably will have no luck with the word no.
dolphins are probably smarter than penguins. Dolphins are 1 of the smartest animals.
No humans are the smartest animals.
The Mayans were smarter than both the Aztecs and Incas. The Mayans were more advanced in technology than both the others.
Some people are born smart because of genes that pass through generations.
Way smart! Neither dogs nor cats are smarter than the others, I'm afraid. You see, each one is better at some things than the others. Also, all the other answers you will most likely get are biased, because of course the dog people will say dogs are smarter and all the cat people will say cats are smarter.