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In mammals, including humans, males are typically larger than females. This is often attributed to the need for male mammals to be physically stronger and more competitive in order to win mating opportunities. In humans specifically, males have more body hair and muscle mass than females.<ref>{{Cite book|last1=Ellis|first1=Lee|url=https://books.google.com/books?id=Skw2mezpvO4C&q=sex+differences+in+size&pg=PA21|title=Sex Differences: Summarizing More than a Century of Scientific Research|last2=Hershberger|first2=Scott|last3=Field|first3=Evelyn|last4=Wersinger|first4=Scott|last5=Pellis|first5=Sergio|last6=Geary|first6=David|last7=Palmer|first7=Craig|last8=Hoyenga|first8=Katherine|last9=Hetsroni|first9=Amir|date=2013-05-13|publisher=Psychology Press|isbn=978-1-136-87493-2|language=en}}</ref>{{Page needed|date=August 2021}}<ref>{{Cite book|last1=Richards|first1=Julia E.|url=https://books.google.com/books?id=MUw0eHzuH2AC&q=secondary+sex+characteristics&pg=PA277|title=The Human Genome|last2=Hawley|first2=R. Scott|date=2010-12-12|publisher=Academic Press|isbn=978-0-08-091865-5|language=en}}</ref>{{Page needed|date=August 2021}}
Birds
== See also ==
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