Mothers in a cooperatively breeding bird increase investment per offspring at the pre-natal stage when they will have more help with post-natal care.

PLoS Biol · 2023 · PMC10635431 · PMID 37943730

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highly significantno p-value reported

I couldn't find this anywhere in the paper, though 'egg position' is used as an important variable in the models, and is highly significant in Table 1.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.