This North American mystery bird is often the victim of another species' breeding behaviour. X Close Image credit. Which species are on the road to recovery? The Encyclopedia of Birds. Natural Range of Anas platyrhynchos. Mallards frequently interbreed with their closest relatives in the genus Anassuch as the American black duckand also with species more distantly related, such as the northern pintailleading to various hybrids that may be fully fertile. Since these scuffles can result in eggs being damaged, destroyed, or lost off the nest, there is a selective advantage to the canvasback not to put up much of a fight [doi:
Also, the paucity of morphological differences between the Old World mallards and the New World mallard demonstrates the extent to which the genome is shared among them such that birds like the Chinese spot-billed duck are highly similar to the Old World mallard, and birds such as the Hawaiian duck are highly similar to the New World mallard.
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The Laguna Madre of Texas and Tamaulipas. Retrieved 1 February During the 20th century, this species experienced dramatic population declines due to sharp reductions of submerged aquatic vegetation as the direct result of draining ponds and wetlands. A Guide to Urban Wildlife Management. Mallards live in wetlandseat water plants and small animals, and are social animals preferring to congregate in groups or flocks of varying sizes. Inferences from mitochondrial DNA".