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Nakul followed the cries from the birds
(a)
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As I noted in my answer to Sofia's question (see below), we already know that the costs do vary. We don't know that they very "less" from one species to another. It's not really clear what this would mean. Less than what? Less than from birds to a non-bird species?
The sentence you've cited says that metabolic costs associated with singing have a measurable effect on bird's daily energy budget, but that doesn't give us any information about whether these costs "vary less" than something else.
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