If every female gives birth to only one young, eventually they'll go extinct. Let's say there were ten, 5 females, 5 males. 5 females give birth, to 4 males and 1 female. Now you have 9 males and 1 female left. And she's going to die (and MAYBE make another female...)
In other words, the death rate is higher than the birth rate if they can only give birth to one baby.
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Let's say there were ten, 5 females, 5 males.
5 females give birth, to 4 males and 1 female.
Now you have 9 males and 1 female left. And she's going to die (and MAYBE make another female...)
In other words, the death rate is higher than the birth rate if they can only give birth to one baby.
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But I've never heard of an entire race of orphans.
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