Where I live they litter the beach because we have a lot of sea birds and many of them wash up due to currents despite living most of their life far from where humans do. Birds cover wide ranges and rarely interact with humans unless it's just to gain some food before taking off again to cover wide territories that often consist of large wild parts humans and predators find it difficult to reach them. Any that do die and fall are usually eaten very fast by scavengers, even on the beach the crabs come and clean up in the night.