The phrase "keep out of cold" should be revised for a more parallel sentence.
What is a phrase?
A phrase is a group of words that conveys a notion and can function as a complete sentence.
"Keep out of the cold" should be changed to a more parallel sentence because if other words are omitted, the sentence would not make sense and would sound like "Pet canaries need to keep out of the cold."
In order to make this sentence parallel, the last example must read "and kept warm" since canaries require "kept warm."
It should be revised to read, "Pet canaries need to be kept out of the cold."
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