According to a new study by University of Leicester researchers, female fish judge males based on their ability to design nests. Male three-spined stickleback fish build nests and provide all the parental care for the eggs. The research team found that males change the design of the nests based on the oxygen content of the water. Female choices flipped from preferring tighter nests under high oxygen condition, to preferring looser nests when conditions deteriorated.
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