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UNIT
4
The reproduction function
SOME CASES OF
SEXUAL DIMORPHISM
Natural Science 2. Secondary Education
UNIT
4
Some cases of sexual dimorphism
Animals that do not display sexual dimorphism
• In certain species of animals, the two sexes differ only in their
sexual organs. This means that they do not exhibit sexual
dimorphism.
• Examples are rabbits, cats, transparent gobies, etc.
Male transparent goby
Female cat
Male cat
Female transparent goby
Natural Science 2. Secondary Education
UNIT
4
Some cases of sexual dimorphism
Sexual dimorphism
• In other species, in addition to having different reproductive
organs, females and males are very different in their
appearance: these species exhibit sexual dimorphism.
• Examples of species that display sexual dimorphism are
lizards, lions, many birds, human beings, etc.
Female teal
Male lizard
Male teal
Female lizard
Natural Science 2. Secondary Education
UNIT
4
Some cases of sexual dimorphism
Sexual dimorphism
Male pheasant
Female pheasant
Male deer
Female deer
Male blackbird
Female blackbird
Natural Science 2. Secondary Education
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