There are many animals that change their skin to their surroundings in order to save themselves from predators. However, ancients insects found fossilized in amber had taken it one step further according to new research.

Researchers from the Chinese Academy of Sciences in Nanjing, found insects were not only changing according to surroundings but actually hide themselves using dirt, leaves, sand and wood. In some cases, exoskeletons of other insects were used as camouflage.

Lead researcher Bo Wang and his team discovered this amazing ability in three groups of insects; chrysopidae (green lacewings), myrmeleontoid (split-footed lacewings and owlflies), and reduviidae (assassin bugs) after researching more than 300,000 ancient amber samples from all areas of the world. One particular bit of amber from Spain showed a green lacewing preserved in mid camouflage.

“Reconstructing the behavior of ancient animals is a challenge to paleontologists because ephemeral events are hardly preserved in the rock,” Wang told The Christian Science Monitor. “But occasionally few fossils document particular behaviors directly. We have some direct evidence of debris-carrying behavior; some fossils are carrying some debris on their back, which are trapped in amber.”

The insects showed they used this complex behavior for nearly 100 million years with only a handful of modern insects today using similar but less complex ways of camouflage. Wang and his colleagues don’t know why this is not so common in today’s arthropods.

“Only one group (chrysopoid larvae) exhibits highly setigerous tubular tubercles on the thorax and abdomen, which are no longer seen in extant chrysopoid larvae,” Wang says while describing the green lacewings. “But we do not know why these morphological adaptations are absent in modern counterparts.”

The research was published in the journal Science Advances.