Slowest heartbeat in a mammal

Slowest heartbeat in a mammal
Who
Blue whale, Balaenoptera musculus
What
4–8 total number
Where
Antarctica ()

The mammal which is presumed to have the slowest heartbeat of any warm-blooded animal is the blue whale (<em>Balaenoptera musculus</em>), with between 4-8 beats per minute. This is dependent upon whether the whale is diving or not.