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Excerpt from A History of British Birds, Vol. 1: With Illustrations of Their Eggs
Interbreeding may or may not mean cross-breeding. Wherever the interbreeding which habitually takes place between the individuals of a species has not ceased, any differences between them can only be subspecific. Subspecies may be defined as groups in which the interbreeding which habitually takes place between individuals in a Species has not yet ceased, but takes place along the whole line of its geographical distribution, though seldom between the two extremes.
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