Why can't I compare birds to humans?
because birds brains are different from human brains. THey do have similarities as in neurons and synapses, but the way they function is very different.
We have instincts just like they do.
yes, but very different instincts at that. i dont think birds have the ability to either stay and fight or fly away when threatened. When they have chicks around it is a natural reaction to protect its young, but they cannot think for themselves as we do... we have a prefrontal lobe, all other animals do not which gives us that ability.
Humans have internal mechanisms like a compass too,
yes, we do, but not as good as the birds. As soon as you take the horizon out of the picture and the sun, like in very dense woods, you will walk in circles all day long... a bird does not have this disadvantage because they can fly and have constant visual of the horizon and the sun or moon.
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we also have a pretty accurate internal clock.
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this "internal clock" you speak is brought about by our circadian rhythm which comes from our highly evolved brain. This was not possible for our ancestors because they did not have the right structures developed enough to work the way ours do.
It's not that it's 'underdeveloped', it is just as developed as your brain is,
this is totally false man! there were many structures in our ancestors brains that were very underdeveloped. what i mean by underdeveloped is that they did not function in the way ours do and they did not evolve certain structures till further down the evolutionary timeline such as broca's and wernekes area that are used for speech and semantics.
their development just went in a different direction than ours did.
what direction?