Coral Hull – EXPERIMENTS WITH COCKROACHES

1.

Cockroaches
are excellent
experimental animals, of which
the common species (periplaneta americana)
become active,
soon after dark each day
& scavengers
continuously for or six hours.

2.

But clever Janet
Harker, of Cambridge
University
found out, that if
one has it’s head off, then it
no longer shows this
circadian rhythm of activity.

 

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