Eland
The Eland bull is the largest (weight-wise) of the african antelopes. The fully mature males can exceed 2000 pounds, and have a large dewlap hanging from their necks. They are very skittish and hard to approach. I have seen them, when running fast, leap in the air 3 feet and cover a distance of 5 feet. The faint transverse white stripes on their sides are more distinct in those living in a northern habitate. The mature males become more grayish as they become older. Both sexes bear horns. [Masai Mara, Kenya.]
Eland
A young adult male Eland in the woodlands with a well-developed, large dewlap hanging from beneath his neck. Compare his size to that of the Impala at his left, at the base of the termite mound. [Mana Pools, Zimbabwe]
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A mature female Eland. Note the small dewlap as compared with that on the males (previous images). [Zimbabwe].
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A mature female Eland:[Zimbabwe].
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A young male Eland. His dewlap is only beginning to develop. When standing at the water, other members of the family at the water, without looking, can tell by the distinctive click-like sounds coming from a males' knee-joints, and the age and importance of the individual pulling up alongside them. If one is in a 'hide' close to the drinking site, one can also hear the clicking. [Zimbabwe].
Eland
Young, mature male Eland. A mature male may be 4 feet at the shoulder, but in spite of his considerable weight of over 2000 lbs., he is a remarkably agile jumper. Both sexes bear horns and dewlaps -- both much heavier and larger in the male. [Zimbabwe].
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A mature, but young bull Eland. A good view of the large dewlap under the neck. When the animal becomes older, its fur becomes greyish. [Zimbabwe].
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A bull Eland with his small family. During the year, another bull took over this small group, fatally goring the one pictured above. [Zimbabwe].
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Bull Eland investigating the reproductive status of his females. I have never heard any explanation of the dewlap's function.[Zimbabwe].