. Bulletin. Science; Natural history; Natural history. 18 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. Typical distribution of neossoptiles in Glands hirsuta. Each dot represents a single feather. by Wetherbee (1958) were 4 mm long, and they appeared to be at least that long or longer in most of the other species I have examined. None of the several suggested functions of natal downs (Wetherbee, 1957:353; Markus, 1970:13) offers any ready explanation for the unique natal pterylosis of Glands hirsuta. The natal pterylosis of relatively few of the many genera and species in this diverse family
. Bulletin. Science; Natural history; Natural history. 18 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. Typical distribution of neossoptiles in Glands hirsuta. Each dot represents a single feather. by Wetherbee (1958) were 4 mm long, and they appeared to be at least that long or longer in most of the other species I have examined. None of the several suggested functions of natal downs (Wetherbee, 1957:353; Markus, 1970:13) offers any ready explanation for the unique natal pterylosis of Glands hirsuta. The natal pterylosis of relatively few of the many genera and species in this diverse family having been examined to date, there is always hope that future data on additional species may clarify the functional significance of the number and distribution of natal downs for nestling hummingbirds. Comments on the Natal Pterylosis of the Apodiformes Most currently used classifications place the hummingbirds (Trochilidae) in a distinct suborder, Trochili, within the Apodiformes. This order also includes the swifts (Apodidae) and the crested swifts (Hemiprocnidae) in the suborder Apodi Table 2. Natal Pterylosis of Glands hirsuta (based on observations of 12 nestlings). Number of downs present Tract Minimum Typical Maximum Coronal Orbital Occipital Cervical (Dorsal) Scapular Spinal Femoral Crural Rectrix 3 3 2 1 1 11 3 0 I 3 6 5 1 2 14 8 1 5. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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