system
Given the following post, respond as if you're commenting on Reddit:
human
how can birds like parrots or ravens be so intelligent ; given their small brains ?

Also , even though other birds have brains similar in size to the parrots and crows , they're not as intelligent . why?
gpt
>even though other birds have brains similar in size to the parrots and crows , they're not as intelligent . why?

Just a quibble  -  

We recognize  certain  things that corvids and psittacines do as  "intelligent",  partly  because  they're  similar  to things that we do.  (E.g.  "Manipulate physical objects")

But  we  should  keep in the back of  our minds the possibility of  different  kinds of  intelligence that  aren't obvious to us  -  for example  many  birds  make  multi-thousand-kilometer migrations,  through  different  sorts  of  environmental  conditions, and  doing navigation that most  humans  would  find a challenge  with  training and  high-tech instruments.