P. hydrobothynus is a sexually dimorphic species of otter. The male otters have very large and colorful mane made of orange, yellow, and red and a dark brown body with a white underside. They have a short stocky body, a short fat tail, and a much more robust pectoral girdle. Males are usually only 1 meter long, and 0.35 meters tall. The female otters are dark brown in color with a white underside and are camouflaged in the murky water and muddy banks. The female stellar river otters are built like a traditional river otter and are very streamline with a long wing-like tail, and a longer skinnier body. Females tend to be roughly 1.2 meters long, and are 0.2 m tall. The male and female both have very thick fur to stay dry and for insulation. The two sexes are so morphologically different they were first thought to be different species; however, a distinct red diamond pattern on the chest of this species was the first clue that the discoverers had in determining they were the same species.
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The following sentence should
The following sentence should be reconstructed and condensed. It sounds rather awkward.
"The male otters have very large and colorful mane made of orange, yellow, and red and a dark brown body with a white underside."
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This is a very concise paragraph with detailed information. You could even reword the introduction of the paragraph and make it a bit longer instead of being such a first short sentence. You could add to it saying that the female and male have distinct characteristics but they are of the same species.