How can I donate in a way that I know my donation will be the difference between an extra human or animal being saved/spared and not being saved/spared.
For example if I vote in an election or stay home it'll make no difference. Of course I think people should still vote but if me donating a relatively small amount (less then 5 thousand let's say) to a specific charity or not donating will not make any difference then I'm not terribly motivated to donate.
I know against malaria foundation sends you an email about six months after your donation telling you where your donation funded nets for.
Is there any other charities like this? Or do I have to get creative and do things like buy ads and billboards to advertise the dominion documentary and whatnot?
I know individual consumer boycott does make a difference in sparing chickens lives Like in the first five minutes of this video https://youtu.be/brKhhZlUoOc?feature=shared he discuses a study that shows the average consumer has a 90 something percent chance of causing 1 - 900 extra chickens to be bred into existence tortured and killed.
https://philarchive.org/rec/MCMAIO
But I'm not sure if an individual donating a relatively small (less than 5k) to charity or not donating to charity has the same effect for saving or sparing animals or humans.
It depends on what you mean by 'know'. Everything is probabilistic, so you can rely on analyses which say that your donation is expected to avert X deaths, but in reality, it will almost certainly be more or less than X.
Also, you can do a lot with $1000.
I think a more specific question might be helpful. Are you looking for the best way to donate to help the most lives, or the most certain donation, even if it leads to a smaller expected impact?