As you are aware, monkeys are closely related to humans because their body structures such as hands, and feet are very much similar to ours and somewhere it is also considered that humans are descended from monkeys. They are even genetically similar to humans as human DNA is on average 96% identical to their DNA. But despite this, they are not able to talk like us. But on the other hand, a parrot is not similar to humans in any way, as neither parrot has lips nor nose, but still, they can talk like humans. So what exactly is there in parrots that derives them to repeat what humans say?
Parrot is among the few birds that can learn and mimic human language. Everyone mostly feels that humans train parrots well enough to imitate their words, then the question is why humans can't train other birds in the same way? Meaning, why can't any other bird repeat the words that humans say, or why only parrots are capable to do so? Generally, parrots are vocal learners, which means they capture sounds by listening and then imitating them.
When research was done on it, it was found that the parrot's brain is completely different from other birds. According to scientists, the shell present in the outer ring of this bird's brain helps it to learn to speak. Their size is larger than such shells of other birds. With this, parrots understand the nuances of the human voice and are able to mimic it. Most biologists even believe that parrots and other speaking birds do not know the meaning of the words spoken by them. Since humans' voices are somewhat similar to those of parrots, they find it much easier to imitate.
The second reason is that the parrot is a social bird that likes to live among humans. It interacts with humans and behaves friendly to them. It also tries to understand human words and gradually becomes capable of imitating their voice, so that it can become part of the human herd. Living more among humans and having an extra structure in the brain, is what makes parrots able to talk when our closest primate relatives cannot.
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