The North American Swans: Their Biology and ConservationAmong birds, swans are relatively long lived species and are also among the most strongly monogamous, having prolonged pair and family bonds that strongly influence their reproductive and general social behavior, which, in combination with their beauty and elegance, contribute to the overall high degree of worldwide human interest in them. This volume of more than 59,000 words describes the distributions, ecology, social behavior, and breeding
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The North American Swans: Their Biology and Conservation