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Fig. 1. Experimental arena. Hatchlings were harnessed to a rotatable tracker arm
that was coupled to a digital encoder, so that the heading of the turtle was
relayed continuously to a data-acquisition computer (not shown). A green
light-emitting diode (LED) was affixed to the eastern wall of the arena at the
water line. The arena in which the turtle swam was enclosed by a lightproof
cover so that the hatchling swam in darkness when the LED was not on. See text
for additional details.
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