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Six trips to a blue tit nest in five minutes

Both parents brought food to the same nest. Two short counts show how much faster they were visiting in the evening.
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  1. Six trips to the nest in five minutes

    ONE PAIR OF BLUE TITS NEAR NOON 2 visits in 4 minutes 6 P.M. 6 visits in 5 minutes How much faster?

  2. Put both on the clock

    Near noon: 0.5 visits/min 6 p.m.: 1.2 visits/min 2.4× the rate

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