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Related: Culture Forums, Support ForumsWhich animal has saved the most human lives? (In the last 70+ years)
I will post the answer in a response

underpants
(190,234 posts)In the 1950s, scientists isolated from its bright-blue blood a clotting agent, coagulogen, that binds to fungi and endotoxins.
This led to a simple, reliable method for detecting impurities in medical equipment and pharmaceutical drugs.
Oxygenated blood is harvested from the pericardium of wild-caught crabs, which are then returned to the sea.
The product is used to test drugs and medical instruments, saving pretty much anyone who has ever received any medical attention (since the 1950s).
Bats are considered the most effective predators of mosquitoes. They can consume hundreds of mosquitoes in a single night, significantly reducing mosquito populations.
illness from mosquitoes probably has killed more humans than any other single source
underpants
(190,234 posts)The award for most lives saved must go to the Atlantic horseshoe crab Limulus polyphemus.
EYESORE 9001
(28,171 posts)Im still not convinced horseshoe crabs arent extraterrestrials
sl8
(16,386 posts)Apparently, much of that reputation stems from inappropriate extrapolation from a study regarding how bats hunted, not how much or which insects. The bats were were contained in a small enclosure with only mosquitos as potential prey. I believe that at least one one study has found that, given a choice of prey, bats tend to prefer insects with more substance (e.g., moths).
There has been at least one recent study that indicates that some bats do eat a lot of mosquitos, but not as much as some of the extravagant claims made in popular media.
https://www.vdci.net/blog/debunking-myths-bats-for-mosquito-control/
Debunking Myths: Bats for Effective Mosquito Control
Tadpole Raisin
(1,788 posts)Helping to create life (and food) - bees.
Of course that wouldnt be enough to sustain settlers in the old days of winter but when/if bees died off wed be seriously screwed.
So many people dont get how fragile our system is.
Anyway, big thanks to the crab. I wouldnt have guessed that.
surfered
(6,456 posts)Omnipresent
(6,868 posts)That fish kicks shark ass!
2naSalit
(96,618 posts)A land animal but I used to see them on the beach when I was a kid. Horseshoe crabs. I wish they'd leave them alone. In trashing that species, there will be hell to pay in the ecosystem.
magicarpet
(18,119 posts).... all day long they roam around devouring MAGA faces....
jgo
(992 posts)From two different websites:
"bees are responsible for a third of the food that we eat. Animals including birds, bats, beetles, and butterflies are all pollinators, transferring pollen between flowers and plants, but the honeybee is the most important pollinator."
"bees are animals. They belong to the kingdom Animalia, specifically within the phylum Arthropoda (insects)."
underpants
(190,234 posts)Ocelot II
(124,493 posts)
Itchinjim
(3,158 posts)underpants
(190,234 posts)Ritabert
(1,032 posts)EuterpeThelo
(34 posts)My guess was going to be either horses or dogs. Thinking of the settlers of our country and the Native Americans before them, where would they have been without horses? Dogs, not only in professional capacities like K9s or bomb-sniffing canines but the stories you hear so often about, for example, a person who had a seizure or whatnot and their dog ran to alert someone and bring back help.
I love my cats, but I don't think they'd lift a claw to go and get aid.
underpants
(190,234 posts)I heard it on a morning radio show and they picked the same.
jmowreader
(52,209 posts)Cats eat rodents and cockroaches - two classes of animal that carry and spread disease. Hence, by reducing the population of disease vectors cats have a very beneficial impact on the human population.
They're also cute and cuddly, which helps too.