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• [...] Mr. Worple in his spare time was what is known as an ornithologist. He had written a book called American Birds, and was writing another, to be called More American Birds.
• Many of these classic methods are still used, with some modern improvements. For example, with the aid of special microphones and automated sound detection software, ornithologists recently reported […] that pine siskins undergo an irregular, nomadic type of nocturnal migration.