. Elements of zoölogy : a textbook. Zoology. 168 VERTEBRATA : AYES OK BIRDS. are alike in differing from all other birds ; and in having no highly developed singing apparatus ; and in having, in most or all cases, some one of their toes capable of being turned and used in a direction opposite to that which is the usual direction of birds' toes. Those known as Scan- sores—as Toucans, Cuckoos, Woodpeckers, etc.—have two of the toes directed forward and two directed backward. FIG. Foot of a Picarian Bird Woodpecker, The Goatsuckers or Caprimulgidse are such as the Chuckwill's-widow of the S
. Elements of zoölogy : a textbook. Zoology. 168 VERTEBRATA : AYES OK BIRDS. are alike in differing from all other birds ; and in having no highly developed singing apparatus ; and in having, in most or all cases, some one of their toes capable of being turned and used in a direction opposite to that which is the usual direction of birds' toes. Those known as Scan- sores—as Toucans, Cuckoos, Woodpeckers, etc.—have two of the toes directed forward and two directed backward. FIG. Foot of a Picarian Bird Woodpecker, The Goatsuckers or Caprimulgidse are such as the Chuckwill's-widow of the Southern States, and the Whip- poorwill, and the well-known Night-hawk, etc., all of which have a small triangular bill, enormous gape, large head, and very lax plumage. As to size, they are much smaller than a common dove. FIG. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tenney, Sanborn, 1827-1877. New York : Scribner
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