Even before the industrial collapse, animals regularly came across absurd remnants of the human race.
Always practical, birds, squirrels, insects, and less visible creatures maintained just enough curiosity to see if an object in their environment had any survival value. There were no monkeys or animals with playful dispositions around.
Plastic was generally left to photodegrade and slowly contaminate. Cloth was picked apart by birds and reformed into nesting. A small percentage of the eggs turned into malformed hatchlings, owing to the vinyl in the plastic.
Always practical, mother birds pushed the failures out to make space for the well-formed babies. Always practical, nature used them as food.