My head can’t get around the idea of why they wouldn’t just grow but slower because of a lower rate of reaction!!
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Birds are warm blooded like mammals, and their body chemistry only works in a narrow temperature range.
This gives them the incredibly powerful metabolisms required for all that flying they do in all sorts of weather, but also requires a lot of effort to keep themselves and their young in that temperature band.
Fish, reptiles, and amphibians have metabolic chemistry that works over a broad range of temperatures, saving a lot of energy but putting them at the mercy of a cloudy day.
Amphibians and most fish are cold-blooded, meaning their temperature depends on the environment.
Birds are warm-blooded meaning their temperature is generated internally, separate from the environmental temperature. If the environment gets too cold, they will die and so must be kept warm
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