Family Brain Body Dive Delphinidae 1824 209530 6.8 Delphinidae 815 60170 5.9 Delphinidae 2387 328000 30 Delphinidae 1148 91050 6.2 Delphinidae 1103 244667 4 Delphinidae 2893 943200 27 Delphinidae 5059 1955450 10.4 Delphinidae 660 66200 3.5 Delphinidae 1542 124857 15 Delphinidae 688 42240 1.5 Phocoenidae 540 51193 5.35 Phocoenidae 866 86830 5.6 Platanistidae 510 82000 2.25 Platanistidae 295 59630 3 Physeteridae 1012 305000 17.7 Physeteridae 622 168500 43 Physeteridae 8028 35833330 73 Monodontidae 2083 636000 18.3 Monodontidae 2997 1578330 26.2 Balaenopteridae 7085 38421500 16 Balaenopteridae 3636 50904000 18 Balaenopteridae 6411 39295000 21.1