Las avestruces no pueden volar.

I see both masculine and feminine uses of avestruz in the corpus.

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Avestruces are officially masculino according to (https://www.rae.es/dpd/avestruz) It says it is a common mistake since avestruces (masculino) are examples of aves (femenino). Secretly, Iā€™m guessing people use the word so infrequently they just forget.

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It could also be due to other words ending in -uz being feminine, such as luz and cruz.

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