The Cambridge natural history, Vol. 09 (of 10)Evans, A. H. (Arthur Humble)
Science
The Cambridge natural history, Vol. 09 (of 10)
Evans, A. H. (Arthur Humble)
Animals; Birds
Fam. VIII. CICONIIDAE.–Of the Sub-Order CICONIAE, the first Family is that
of the Storks, which have long necks and also long stout beaks, usually
straight and fairly cylindrical, but occasionally compressed, as in
_Leptoptilus_, upturned towards the tip, as in _Mycteria_, or decurved, as
in _Tantalus_; in _Anastomus_ there is a wide gap between the grooved
mandibles, the edges of the maxilla possessing fine horny lamellae. Very
remarkable, moreover, are the unprotected pervious nostrils, which are mere
perforations in the bony sheath. The tibia is partly bare, while the
elongated metatarsus is covered with hexagonal scales, becoming more
reticulated behind in _Leptoptilus_ and _Mycteria_; the partially webbed
front toes and flattened claws are in most cases very short–though
lengthened and more slender in _Tantalus_–and rest upon horny pads,[94] the
hallux being slightly elevated. The wings are ample and fairly long, with
eleven stout primaries in _Ciconia_ and twelve elsewhere, and from fourteen
to twenty-five secondaries, the inner of which are often greatly
{96}developed. The short tail is normally even or slightly rounded, with
twelve broad feathers, but in _Dissura_ it is deeply forked[95] and rigid,
while the unusually stiff coverts extending from beneath are easily
mistaken for rectrices. In _Leptoptilus_ these elongated coverts are soft,
and are the genuine "Marabou feathers." The furcula is U-shaped, the tongue
rudimentary, the aftershaft present or absent, and there are no powder-down
patches; the trachea in the male of _Tantalus ibis_ has several
intrathoracic convolutions,[96] while there is an entire want of syringeal
muscles. The adults and young possess uniform down, that of the nestlings
being greyish or whitish.
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