Yes, the word birds is a plural, common noun; a word for any birds of any kind; the plural form for the singular noun bird.
A proper noun is the name of a person, place, thing, or a title; for example:
Most common domestic bird. The red billed quela finch is the most common wild bird.
The most common bird in Connecticut is the sparrow.
A "parson bird".
Eagle is a kind of bird not a name of bird therefore it's a common noun.
The Common Raven is the provincial bird of yukon territiries.
The national bird of Sweden is the common blackbird.
Canada's national bird is the Common Loon.
The common temperature of a wild bird would be about 50-55 degrees Celsius
The noun 'dove' is a common noun, a general word for a type of bird, a word for a thing.
Feathers are a structure that are common to all species of bird. Most feathers are very similar in structure, although they vary depending on how and where the bird lives.
The South Dakota state bird is the common Pheasant.
This question is not very clear.