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Option 2: "The colour of their fur"
Explanation: The text states that 'mostly the male is red, the females are a blue-grey and so are the young.' This directly indicates that the color of their fur is a distinct physical characteristic that differentiates male and female red kangaroos.
Option 1: "The size of their pouch"
Explanation: The text does not mention anything about the size of the pouch being different between male and female red kangaroos. Therefore, this option is not supported by the text.
Option 3: "Their ability to jump distances"
Explanation: The text does not provide any information regarding the jumping abilities of male or female red kangaroos. Thus, this option is not relevant to the text.
Option 4: "The size of their offspring at birth"
Explanation: While the text mentions that offspring are 'no bigger than a bean' at birth, it does not differentiate between the sizes of male and female offspring. Therefore, this option does not accurately address the question.
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