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Good thanks for the given details. Previous research has shown that under poor nutritional conditions, female Zebra Finches grow more slowly and survive less well compared to males. Brood parasites and their hosts have probably secondarily influenced the diversity of egg appearance.

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There are virtually no small males in these populations. Proceedings National Academy of Sciences



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Bigger eggs tend to lead to bigger young that are more likely to survive.

SEX CHANGE IN FISH FOUND COMMON

This is the converse situation to that described 30 years ago for mammals, but it makes sense for Zebra Finches. Life cycles adjusted to environmental change Both sexual and nonsexual reproduction may be exploited or adjusted to meet widely fluctuating environmental conditions, especially those of a regular seasonal character.

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