UAS imagery reveals new survey opportunities for counting hippos.

PLoS One · 2018 · PMC6235304 · PMID 30427890

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highly significantno p-value reported

Experienced observers scored better detection rates than inexperienced ones but differences between observers within each group remain highly significant for both parameters.

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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.