Fastest marine mammal

Fastest marine mammal
Who
Unknown
What
55.5 kilometre(s) per hour
When
12 October 1958
On 12 October 1958 a bull killer whale (Orcinus orca) an estimated 6.1-7.6 m (20-25 ft) long was timed at 55.5 km/h (34.5 mph) in the northeastern Pacific. Similar speeds have also been reported for Dall's porpoise (Phocoenoides dalli) in short bursts.  Orcas are "apex predators", ie they have no natural predators