The Ancient Glass Sponge
This harp-shaped sponge constructs an intricate skeleton of silica, forming a delicate, glass-like structure that can survive for thousands of years. Unlike typical sponges, it actively captures small crustaceans with sticky threads. Some specimens are estimated to be over 10,000 years old, making them among the longest-lived animals on Earth. Their crystalline structures rise from the seafloor like alien architecture.