What is an insect or animal that unless you kill them all or eliminate them all, you will keep getting infested with them?

All of them.

Humans

Lice
Fleas
Roaches
Politicians.

@marinelife Certain insects like wasp, or bees you can get rid of and they won’t come back until next season, and maybe not then. Or wild boar you can get rid of the herd and you won’t have to deal with them for a while, or ever with the right barriers in place.

@Dog Politicians are not insects or animals, though I know some might find that debatable.

Bed bugs. They are quite hardy and a pain to get rid of.

@Hypocrisy_Central Humans are animals. Therefore, politicians is a perfectly acceptable answer.

@Hypocrisy_Central You can get rid of one hive, but what’s to stop another one from coming back? It is an ongoing process.

@Dog is spot on. Oh man, when I lived in Sand Diego years ago keeping my apartment flea free was a major issue. All it took was for one of the cats to escape for about an hour, instant flea infestation. Up here in these hills the fleas do not survive well with the cold winters.

Zombies.

Holy shit, @Dog is back!
My day just got better

Statists

I’m fighting my arse off to get rid of bed bugs. I’ve even replaced furniture, to no avail.

The only thing that kills them is rubbing alcohol, but they are really good at hiding the damned eggs.

Because this part of England is so wet, the most troublesome pest I have is slugs. Somehow they manage to get into the house from under the floorboards (we have no basement, just a two foot space with mud at the bottom). I don’t know where they get in but I often find them on the kitchen floor first thing in the morning. But I won’t kill them because they’re generally beneficial creatures. I just scoop them up and put them outside. I certainly have no intention to mass-poison them all.

Gremlins.

Rabbits.

Feral cats
skunks
fleas
bed bugs
ants
mosquitoes
termites
rats
mice

Any critter that does not have a face (spiders, centipedes, etc) I kill without remorse. I hate them, my hate is primal and irrational, and I do not care. If it has no face, it is dead.

I go after mice with a vengeance. If I see one I set out at least 16 traps for 6 weeks to cover one full breeding cycle. I change the bait every few days so it stays fresh and delicious.
I never catch just one.

Fleas.

Thank God for Frontline which affects ALL stages of their growth cycle.

Fire ants. You get rid of one colony and another moves in. They truly suck! I’d take a roach infestation any day over those bastards.

A few of animals that I could do without are: scale insects, aphids, rabbits and black tail deer that destroy my garden. Also coyote that killed and ate my poor Felis domestica.

Some plants that I fight a never ending losing battle with are: moss, algae, fungi and various weeds.

Squirrels.
Birds.
Bees.
And definitely earwigs.

Earwigs are the worst. I don’t kill bugs because I’m a vegan lol, the last earwig I rescued, I put it on the front lawn and my mom said a few hours later she found an earwig at the front door! 0_o WHAT! They must have a scent trail they follow. :/

Fruit flies. I’ve had an infestation of those in my place once. Took a week and a half or so to kill them through traps, and by killing the eggs. I read a lot on them, plus ways to get rid of them and I applied what I learned. It worked, but had I done nothing, they would have stayed forever. And this was in the middle of Winter. I suppose if there was nothing left for them to feed on, they would eventually die, or go away. But Hell, it was horrible when they were around.

Lesson to be learned; clean out your empty beer bottles, or get rid of them.

@ragingloli took the first answer that came to my mind when I read the question.

damn

but I still gave a GA

Haha, I’d love to know if all you people who would like humans to be destroyed would be willing to die yourselves along with the rest, as well. :)

Yes, I would be willing @Symbeline but I don’t trust your ilk to follow suite. I get the feeling that if I/we honored our committment and went first you would just sit back and say something like “Well, the earth is a lot less crowded now and at a sustainable level so maybe we don’t ALL need to die” and then just blow off our deal and keep on living until you once again reached critical mass and then it would happen all over again with the honorable ones keeping their part of the bargain and the cockroach like scum surviving.

I, for one, would never agree to make such a deal, in the first place. And I find it very hard to believe that you would agree to this. Easy to say when it’s never going to happen. So now I’m scum with no honor, am I?

@talljasperman Wabbits?
A couple of outdoor cats and there will be no more dang wabbits, or you will not find a whole one when you do.

@Blueroses Fire ants. You get rid of one colony and another moves in.
Those would be pesky to eliminate, it is not like you want to poison you whole yard.

@YARNLADY mosquitoes
Yes, those slimy, despicable, maniacal, sinister, heinous, vile, little blood sucking vampires of the insect world. Even if you keep standing water from around your house, if the city has standing water by way of unused fountain, clogged up creek, or your neighbors have standing water on their property it nullifies all of your efforts.

@Buttonstc Fleas.
Thank God for Frontline which affects ALL stages of their growth cycle.
You can kill all of the fleas, though in the house only. Once you get them all off the animal and out of the house, so long as you keep the Frontline, or Advantage regiment, etc, up, you won’t have a flea problem again unless some untreated animal reintroduces fleas to your house or you slip and allow them to re-infest your animal.

@Symbeline I offended.

I apologize.

ANTS
spiders
centipedes (oh god I hate those things)

In as much as I can I try to trap and release. Yes, even centipedes. However if any of my cats are trying to eat one, i grab it and kill it. I don’t want sick or hurt cats.

@Hypo

You’re right. And if ones cats are indoor only, three months of Frontline (without any interval longer than 30 days) will kill every one of them.

But all bets are off if the cat goes outside or a new cat with fleas comes in.