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.

I want to know the most certain donation both for helping humans and the most certain donation for helping animals (mammals and or birds).

By certain I mean most likely that it will make an impact unlike me voting in a presidential election or staying home. Whatever donation is least likely to be like voting.