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Message: <blockquote data-quote="Paul Collins" data-source="post: 1273750" data-attributes="member: 57303">I think stick to your guts.If I go out for a day of birdwatching and I hear a nightingale, I add it on the list, but use a symbol (one set of speech marks ") to show that I heard it. If I end up hearing and seeing it, I use "1 (meaning saw 1, heard it).   However, nightingale is not on my lifelist because I have not actually seen one yet. There are several rare birds out there which are easy enough to hear (such as bittern - althoug I confess I haven't heard one booming), but very hard to see. If you start putting rare birds on your list on the basis of hearing them rather than seeing them, the wrong illusion might be created.</blockquote>