Summary

George Montagu Transactions of the Linnean Society of London (1818)

When searching in thick grass or in the mud for its prey, the bill is kept partly open: by this means I have observed it take eels in a pond with great dexterity: no spear, common in use for taking that fish, can more effectually receive it between its prongs than the grasp of the Stork's open mandibles. A small eel has no chance of escaping when once roused from its lurking-place.
Source: Wikisource

George Montagu Transactions of the Linnean Society of London (1818)

It prefers an elevated spot on which to repose: an old ivy-bound weeping-willow, that lies prostrate over the pond, is usually resorted to for that purpose. In this quiescent state the neck is much shortened by resting the hinder part of the head on the back; and the bill rests on the fore-part of the neck, over which the feathers flow partly so as to conceal it, making a very singular appearance.
The Black Stork, perhaps, is not more delicate in its food than the white species: fish appears to be preferred to flesh, but when very hungry any sort of offal is acceptable.
Source: Wikisource

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