Table 2.

Compactness and CDI values estimated for sampled specimens, with additional Pygoscelis values based on images from Wilson & Chin (2014)

Specimen	Compactness	CDI
Gavia immer humerus	0.726	0.485
Calonectris borealis humerus	0.636	0.395
†Small Eocene humerus	0.775	0.535
†Large Eocene humerus	0.897	0.850
†Palaeospheniscus sp. humerus	0.875	1.123
Spheniscus sp. humerus	0.879	0.828
Aptenodytes forsteri humerus	0.917	1.374
Gavia immer femur	0.524	0.319
Calonectris borealis femur	0.370	0.207
†Small Eocene femur	0.941	0.778
†Large Eocene femur	0.984	0.947
†Palaeospheniscus sp. femur	0.805	0.555
Spheniscus sp. femur	0.877	0.654
Aptenodytes forsteri femur	0.884	0.520
Pygoscelis antarcticus femur (UNCW B979)	0.820	0.700
Pygoscelis papua femur (UNCW B980)	0.872	0.639
Gavia immer tibiotarsus	0.549	0.333
Calonectris borealis tibiotarsus	0.411	0.234
†large Eocene tibiotarsus	0.974	0.758
†Palaeospheniscus sp. tibiotarsus	0.922	0.727
Spheniscus sp. tibiotarsus	0.743	0.498
Aptenodytes forsteri tibiotarsus	0.891	0.616
Pygoscelis antarcticus tibiotarsus (UNCW B979)	0.885	0.687
Pygoscelis papua tibiotarsus (UNCW B980)	0.872	0.639

CDI, cortico-diaphyseal index.