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Anyway, back to frogs. The common frog is unusual in that it has "sex races". Not as in speedrunning a shag. Common frogs have multiple different approaches to sex determination which vary by region.

A common frog living in colder northern climates will probably hatch as either female or male. The male will have XY chromosomes; the female XX. However, a frog born in a milder climate such as the Netherlands or the UK will always hatch with ovaries, regardless of chromosomes.