45
0
250
500
750
1000
0123
length of leg segment (mm)
Body mass, m, versus leg
length, L, for the cockroach
Periplaneta americana.
The data points rep-
resent individual
specimens, and the
curve is a fit to the
data of the form
m=kL3, where k is
a constant.
0
200
400
600
800
1000
05001000
body mass (g)
Surface
area versus
body mass for
dwarf sirens, a
species of sala-
mander (Pseudo-
branchus striatus).
The data points
represent individual
specimens, and the curve is
a fit of the form A=km2/3.
0
1
2
3
4
5
6
7
8
0.00.20.40.60.81.0
body mass (kg)
Rate of oxygen
consumption versus
body mass for guinea
pigs at rest. The
curve is a fit of the
form (rate)=km2/3.
0
1
2
3
4
5
0246
length (cm)
Diameter versus length
of the third lumbar
vertebrae of adult
African Bovidae
(antelopes and oxen).
The smallest animal
represented is the
cat-sized Gunther's
dik-dik, and the
largest is the
850-kg giant
eland. The
solid curve is
a fit of theform d=kL3/2,
and the dashed
line is a linear
fit. (After
McMahon and
Bonner, 1983.)
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