Well, not sure where they're getting their numbers from but a lot of animals (Ants/Flys) have very short lifespans so if there's 10,000 trillion ants I could easily see more than 0.005 quadrillion ants deaths a year (but not more than 0.06 quadrillion for ants).
What now?
https://animals.mom.com/kingdom-animalia-1131.html
So every year a quarter of all animals die?
Where are you getting your information?