AMERICAN GREEN-WINGED TEAL 
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only one drake, the ducks quarreled amongst themselves for his attentions and in- 
terfered with one another’s breeding plans. The same was true if there was only 
one duck and several drakes. 
Dr. Warren found this species hardy and long-lived but he has lost some from 
tuberculosis. Under the same conditions he found the Blue-winged Teal {Anas 
discors) too tender to be of any use at all. 
Hybrids. Wild hybrids are extremely rare. Some people have the impression 
that duck hybrids of many sorts are common, but when we remember the millions 
of ducks which annually pass through the hands of observant sportsmen or market 
men, many of whom could not fail to notice such striking hybrids as those between 
Teal, Mallard, Widgeon and Shovellers, we must conclude that mixtures between 
the ducks in the natural state are very unusual indeed. Of course it goes without 
saying that few hybrids except full-plumaged males ever reach the hands of the 
ornithologist because female hybrids are rarely recognized. I find but one wild 
hybrid described: Anas carolinensis x Anas boschas (W. Stone, 1903a). 
