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Downplayed: Male Troperians have larger arms than females, but are otherwise quite similar.
Troperians evolved so that the males gather large amounts of materials in small caves, so being short and muscular was a trait acquired through natural selection, while females being taller allowed them to reach food in trees more easily.
Their hormones affect their appearance.
Bizarre Sexual Monomorphism
Male and female Troperians are completely identical, even down to the genitalia.
Subverted: Two characters, Aliice and Bohb, are a female and male Troperian respectively. Aliice is a Green-Skinned Space Babe, and Bohb is small with giant arms. The rest of the cast assumes that all Troperians are equally dimorphic. However, a visit to planet Troperia proves that this is not the case; Bohb is just deformed.
Enforced: Male Troperians were first depicted with bulky animatronics. Female ones were manufactured but ended up defective. They were short on both time and budget so they had to substitute make up on an actress.
Lampshaded: "Are you two even the same species?"
Invoked: A Mad Scientist in creating an artificial species, purposefully gives both sexes vastly different physical characteristics.
Defied: Not applicable. (This trope is beyond the control of the characters.)
Conversed: Alice is watching Trope Trek and sees the alien of the week. She turns to Bob and says, "Wow, what did these guys evolve from? Anglerfish?"