Partially true. It depends on how we define “trash.” By definition- animals do leave trash. Most is just bio degradable. Humans tend to create things that when turned in to trash- are usually more harmful and long lasting to an ecosystem because they aren’t generally found in that ecosystem in the form we leave them in. But animals that migrate or travel long distances can upset ecology- again- generally not as bad as us- but entire species primary adaptation in the food web is to feed off the discarded “trash” and waste left by other animals. It can take millions or billions of years for animals to adapt through evolution to changes- so perhaps in millions of years (if we are still around) human trash would become an integral part of the ecosystem required for some species survival. There are already animals that have behaviorally adapted to use some of our trash to their benefit.
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