Although it stood with its head raised, even its yellowed wings had been eaten by insects.
So here you would not want to quote the middle sentence, since it is repeated again in the more informative last sentence.
If you want to borrow an idea from an author, but do not need his or her exact words, you should try paraphrasing instead of quoting.
Most of the time, paraphrasing and summarizing your sources is sufficient (but remember that you still have to cite them! If you think it’s important to quote something, an excellent rule of thumb is that for every line you quote, you should have at least two lines analyzing it.
Whenever you change the original words of your source, you must indicate that you have done so.
Otherwise, you would be claiming the original author used words that he or she did not use. You could accidentally change the meaning of the quotation and falsely claim the author said something they did not.