Some
of the movements made by the egg are very subtle. The water
must be very still while the eggs float. Even a small breeze
will interfere. "I write down the nest number, which egg
is being floated, its stage of incubation and how active the
embryo is.
I write the time, the nest material, water depth, and
how close we were when the adults flushed," explains Brian.
He uses the stick to measure water depth.
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