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Line 82: 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~~, on the other hand,~~ often exhibit colorful [[plumage]] that attracts females.<ref>{{Cite book\|last1=switze\|first1=International Conference on Comparative Physiology 1992 Crans\|url=https://books.google.com/books?id=zunYrumtsR8C&q=sex+differences+in+birds&pg=PA303\|title=The Differences Between the Sexes\|last2=Bassau\|first2=Short &\|date=1994-08-04\|publisher=Cambridge University Press\|isbn=978-0-521-44878-9\|language=en}}</ref>{{Page needed\|date=August 2021}} This is true for many species of birds where the male displays more vibrant colors than the female, making them more noticeable to potential mates. These characteristics have evolved over time as a result of sexual selection, as males who exhibited these traits were more successful in attracting mates and passing on their genes. == See also ==

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