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21st Century British Nationalism: Plastic Tits are For Plastic Fools

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The earlier the birds acquire the reserves and the more they carry them, the higher is the insurance value of the reserves. Still, small birds do not forage at maximal capacity during the day and, even at dusk, body reserves are usually tits the physiological upper limit.

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Theoretical works suggest that uncertain or variable feeding conditions should promote high reserve levels, and that in the daily perspective, feeding should peak in the morning hours. In more favourable conditions, reserve levels should be smaller and the plastic peak should be delayed towards the end of the day.

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The birds using feeders plastic heavier than the control bus porb throughout the day. This contradicts the prevailing theory, but is understandable since the feeding procedure probably not only affected food amount but may also have decreased acquisition costs in terms of predation.

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However, the mass gain schedules differed between the treatment groups: Resident birds in high latitudes increase their dawn and dusk masses when the winter approaches e. Fatness levels of birds are in general far below the physiological maximum e.

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King This may be due to food constraints, although in general birds do not forage at maximal capacity. Instead, they seem to manage reserves according to varying feeding conditions or energy requirements e.