"I have wished a bird would fly away. And not sing by my house all day; have clapped my hands at him from the door when it seemed as if I could bear no more. The fault must partly have been
in me. The bird was not to blame for his key. And of course there must be something wrong in wanting to silence any song." - Robert Frost
Some birds, especially corvids and parrots, are among the most intelligent animals; several bird species make and use tools, and many social species pass on knowledge across generations, which is considered a form of culture. Many species annually migrate great distances.