Silkhenge structures are a means of

spider Spiders ( order Araneae) are air-breathing arthropods that have eight legs, chelicerae with fangs generally able to inject venom, and spinnerets that extrude silk. They are the largest order of arachnids and rank seventh in total species ...

reproduction used by one or more currently-unknown species of spider. It typically consists of a central "

spire A spire is a tall, slender, pointed structure on top of a roof of a building or tower, especially at the summit of church steeples. A spire may have a square, circular, or polygonal plan, with a roughly conical or pyramidal shape. Spires are ...

" constructed of

spider silk Spider silk is a protein fibre spun by spiders. Spiders use their silk to make Spider web, webs or other structures, which function as sticky nets to catch other animals, or as nests or cocoons to protect their offspring, or to wrap up prey. ...

, containing one to two eggs, surrounded by a sort of fence of silk in a circle.

Discovery

In August 2013, Georgia Tech student Troy Alexander was visiting

Tambopata National Reserve Tambopata National Reserve ( es, Reserva Nacional Tambopata) is a Peruvian nature reserve located in the southeastern region of Madre de Dios. It was established on September 4, 2000, by decree of President Alberto Fujimori. The reserve protects se ...

Peru , image_flag = Flag of Peru.svg , image_coat = Escudo nacional del Perú.svg , other_symbol = Great Seal of the State , other_symbol_type = Seal (emblem), National seal , national_motto = "Fi ...

. He found, under a tarpaulin, a tiny bit of silk in a circular pattern approximately one inch in diameter. Upon further investigation of the area, Alexander found three additional similar structures. He posted a picture on

Reddit Reddit (; stylized in all lowercase as reddit) is an American social news aggregation, content rating, and discussion website. Registered users (commonly referred to as "Redditors") submit content to the site such as links, text posts, images ...

asking for help identifying it. No information was forthcoming, as this turned out to be a completely unknown phenomenon. His discovery acquired the name "silkhenge" because of its similarity to

Stonehenge Stonehenge is a prehistoric monument on Salisbury Plain in Wiltshire, England, west of Amesbury. It consists of an outer ring of vertical sarsen standing stones, each around high, wide, and weighing around 25 tons, topped by connectin ...

. At the end of that year, an eight-day expedition led by Phil Torres found dozens more examples of this phenomenon, generally on the trunks of

bamboo Bamboos are a diverse group of evergreen perennial flowering plants making up the subfamily Bambusoideae of the grass family Poaceae. Giant bamboos are the largest members of the grass family. The origin of the word "bamboo" is uncertain, bu ...

and cecropia trees. Spiderlings hatching from the structures were documented, but like many baby arthropods they lacked the features typically used to identify adults, and none lived to adulthood. DNA tests were also inconclusive, so the species creating these structures remained unidentified. A video was posted on YouTube of spiderlings hatching. One hypothesized purpose of the fence is that it serves to trap mites and other small arthropods known to share the same habitat. This could, in turn, secure a food source that would be easily accessible to the spiderlings upon hatching. It has also been proposed that it protects the eggs and spiderlings from possible predators such as ants.

References

Spiders Silk Invertebrates of Peru Shelters built or used by animals Eggs 2013 in biology {{ethology-stub