No. If it is the name of a person, place, or thing it becomes a proper noun. Otherwise it is a common noun and is not put in caps.
No, not unless you are referring to an organization.
Yes I have reason to believe that its capitilized
humming bird does not need to be capitalized.
it does not need to be capitilized.
No, not unless it is a specific college..ie Manchester College, or if it begins the sentence.
No, the word astronaut is not capitalized in that sentence.
No, except at the beginning of a sentence because it is not a proper noun but American should always be capitalized.
No
No.
The word "rhino" should not be capitalized unless it is at the beginning of a sentence or part of a proper noun like a specific species or organization name.
Judging by your pallor you need to go out and get some sun.
In the warm sun the crops started to sprout.