Fact Snacks!

almost-all-mammals-live-for-around-1-billion

Almost all mammals live for around 1 billion heartbeats. 

For a rabbit, which has a quick pulse, it takes about 3 years to reach a billion heartbeats, but a slow-pulsed elephant can go more than 80 years. 

Only humans can push their hearts past 2 billion, thanks to modern medicine, food preservation technology, and water purification. 

(Source, Source 2, Source 3)