A flamingo is a common noun, you don't have to capitalize this word.
Eagle is a kind of bird not a name of bird therefore it's a common noun.
No bird is a common
Unicorn is a common noun.
Common because they are not names.
Robin is a proper noun when it is a name, but common when it is the bird. Proper nouns are the unique names of people, places, or things. Common nouns are the words for general things. If a common noun is part of a name, it becomes a proper noun. Pronouns always replace proper and common nouns.
As a name of a road , Park Avenue', it is a proper noun, and both words star with a capital letter. However, when used separately, as 'the park, or 'the avenue', they are common nouns and so not need a capital letter.
It is a proper noun, because it is the name of a specific thing.
Proper noun
proper
The word Harris is a propernoun, the name of a person. A proper noun is always capitalized.
The noun 'song' is a common noun, a general word for any piece of music with words to be sung or the musical sounds that a bird makes.A proper noun is the name of a specific person, place, or thing. A proper noun for the common noun 'song' is the name of a specific song.
The noun Phoenix (capital P) is a proper noun, the name of a specific city; the name of a specific place.The noun phoenix is a common noun (lower case p) as a word for a bird in legends that obtains new life by arising from the ashes of its predecessor; a word for any such bird.