Notice how birds move their head around so rapidly like that. Is it not because of their high ass heart rate bpm?

Also, notice how squirrels move their body around so rapidly, sorta the same way a bird moves their head.

>human heart: 60 - 100 bpm
>rooster: 250 - 300
>sparrow: 450
>squirrel: 450
>falcon: 600 - 900
>humming bird - 1000