>>2649967They're not smart/capable enough to do it on a large scale like us, retard.
Every piece of the ecosystem is important, look what happens when invasive plants get put in a region without their natural predators/parasites.
>>2649647>>2650454I know it's a meme but ticks (and mosquitos) are unironically important too. Blood is very nutritious but is locked away within the bodies of animals so it isn't usable to most of the ecosystem. Ticks and skeeters drink blood and when they get eaten their predator gets the nutrients from the blood they indirectly ingested.