[M]any insects and spiders, as well as vertebrates like frogs, have evolved to resemble bird droppings, hiding themselves from predators. [T]his has happened in the spider Cyclosa ginnaga from East Asia.
[T]his spider weaves decorations into its web that look like droppings, but some spiders of this genus have also evolved to look like droppings. When a spider sits in its decoration, the combination looks remarkably like a bird dropping, thereby avoiding attention from predators.