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In page Spix's macaw:

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Spix's macaws choose their own mates independently, so best genetic pairings are not guaranteed. Artificially created "pairs" may groom and associate with each other as if they were a pair, but in fact are not mates, and it may take several seasons to determine this. Another complication is that infected birds cannot be paired with uninfected birds, due to risk of spreading viral diseases.[2]