THE MYSTERY Silkhenge spider

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We Solved An Amazon Rainforest Mystery (w/Video)

The Silkhenge spider. About six months ago, graduate student Troy Alexander took photos of this odd structure. What was it? The images went viral and neither the internet nor experts could figure it out what was this weird web tower in the Amazon

 Silkhenge spider

The inside ‘tower’ and outer ‘fence’ of this Amazon mystery.

 So we returned to the Tambopata Research Center six months later with a team lead by myself, Phil Torres, to solve it. Alongside were entomologists Lary Reeves and Geena Hill, both from the University of Florida entomology department and with strong field experience, and photographer Jeff Cremer to document the structure with macrophotography.

The previous theories on how these structures were formed were vast: slime mold, spiders, fungus, lacewings, and some even thought it was a hoax. With just the pictures to go on and no other similar structure found in the literature, we approached this very open-minded but did suspect a cribellate spider for the reasons well outlined here.

For this expedition, the goal was to find more of these structures, find what’s making them, and try and figure out a function for the odd ‘fence’ with a ‘tower’ in the center.

We weren’t even sure we’d find more on the small fish pond island in which the first two were seen, but over a stretch of trail about 200m long we ended up finding upwards of 45 of them as the week went on. After isolating some of the structures and long hours of observations in the field, day and night, we’ve come up with the following conclusions:

 

1. It was created by a spider. Three of the structures hatched out these spiderlings. 

Spider

structures hatched out these spiderlings.

We’re still attempting to identify the spider. There are several things that make this unusual. For one, it is not common for spiders to lay eggs and abandon them, they typically place silken egg sacs in their own web to protect. More oddly, it appears that there was only a single egg per structure (see image below). This, as far as we can tell, would be the only known occurrence of a spider laying a single egg per egg sac.

We saw a few adult spiders around that were prime suspects, but never saw any making it, so the construction and culprit remain a mystery.

2. There were a lot of mites around. The mites we found on and in the structures threw us off the trail for a bit as we’re unsure of the potential for the few groups of silk-producing mites to create such a structure themselves. We were able to rule them out once the spiderlings hatched, however, we noted several instances of mites being seemingly trapped inside or along the ‘fence’ of the structure, and other times crawling directly on the inner tower (below).

 Strange_Egg_with_Mite

One ‘tower’ toppled, leaving an egg exposed. Mites like this were often seen in or on the structures.

One hypothesis is that the structure might be designed to trap mites, serving as an easy first meal for a hatching spider. There is also the possibility of the spiders putting some sort of chemical attractant on the egg case to bait the mites, as chemical lures have been documented several times with spiders.

Spider

Mites (the round, shiny objects) appear to be trapped within this structure.

 

Mites (the round, shiny objects) appear to be trapped within this structure.

In addition to potentially capturing mites, the ‘fence’ part of the structure may function as a defense against ants. The silk could potentially ensnare ants, and the distance from the center may prevent ants from easily detecting a food source within.

 

 3. The spider appears to be habitat-specific. We only found them in a particular area of successional forest habitat with a high abundance of Cecropia and bamboo. This seems to fit the habitat of another single structure that was photographed in Ecuador. This information will allow us to survey other similar habitats to search for more.

Island exploration in the amazon

The island where the spider was found can be seen in the lower-left corner.

 

Watch footage of the spider: We’re eager to hear from spider experts out there who can provide some guidance on ID and the evolutionary origin of the structure. There is much work to be done observing these in their natural environment to truly get to the bottom of it, but until then we can at least sleep at night knowing we’ve solved one part: it’s a spider.

  

For image/story usage please contact: therevscience@gmail.com

 

By Phil Torres

 

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Fantastic to be deep in the forest surrounded by incredible wildlife with our amazing guide Juan Carlos Yatto, who really knew his stuff! Also his photography skills meant that we could share our experience even better through his telescope using our phone cameras! We learned so much!! He went to extra lengths to find butterflies and moths for us along with so many different birds and monkeys. This was a travel highlight for us as experienced wildlife travellers. We loved our spacious room with no windows and open to more wildlife visitors but after 5 nights the bed could have been a little more comfortable. Luckily we had a second bed to use. Otherwise it was fantastic with hot water showers and fresh drinking water all the time. We were amazed at the variety of food on offer for breakfast, lunch and dinner and couldn’t believe they could have such a wonderful food offering in such a remote location. Even the wine and cocktails were great. I highly recommend spending the extra money and time getting to this location. We stayed at another lodge later which was closer to Puerto Maldonado and there was far less wildlife. Read all

Ederson made the stay at the lodge amazing. I have had many guides around the world and Ederson may be the best I have had across 50 countries. The lodge itself is nice, and has electricity. Food is good, and you really feel immersed in the amazon staying there. Its great that a portion of the money goes back to conservation and research. Noteworthy details: Ederson, the "commander" is the best guide! Read all

Through a travel agency in Lima we booked a 4day/3-night stay at Refugio Amazonas. We were looking for a lodge that was far away from Puerto Maldonado but didn't require almost a day to get there (like TRC), with extensive walking trails and with the principal jungle highlights nearby. We were not disappointed. As we later learned, this is probably the best lodge in the region! Well run, quiet, excellent food, beautifully located in the middle of the forest, everything was "right". Surprisingly there were few mosquitos or bugs. Emperatriz (MP as some call her), our guide, has a keen eye and took us on some unforgettable walks and boat rides, both day and night. The birds at the clay lick were fantastic. The lodge also had evening lectures by young researchers as well as special activities such as collecting night moths and setting a trap camera. We later received videos and photo's of what was found (including a puma!). I can recommend this lodge without reservation. Read all

Abbiamo scelto il Tambopata Research Center perché il nostro obbiettivo era di poter vedere le are da vicino. Ci siamo stati ad inizio dicembre scorso, l'inizio della stagione delle piogge, perciò abbiamo scelto di restare 5 notti/6 giorni, abbiamo messo in conto di perdere delle giornate a causa della pioggia e per la lontananza da Puerto Maldonado, per nostra fortuna durante il nostro soggiorno ha piovuto solo il giorno di partenza proprio quando arrivavamo in aeroporto. Non c'é stato un giorno che non ne abbiamo visto: are di diverse specie e colori e molti altri uccelli e primati, spettacolare l'incontro a pochi centimetri con un formichiere bianco, ma non il giaguaro. Consigliamo di pernottatre almeno 3 notti, il viaggio é molto lungo. Noi eravamo all'aeroporto di Lima già alle 8:00 di mattina e tra un volo in ritardo, uno spostamento in bus di ca. 45 minuti per arrivare al fiume, ed un trasferimento in barca veloce, siamo arrivati al lodge verso le 16:30. All'aeroporto ci ha accolto la nostra guida privata Alfred, che ci ha seguito per tutto il soggiorno, di giorno in giorno abbiamo deciso le escursioni da fare, ed Alfred si é rivelato essere una super guida, un occhio di falco per scoprire anche il più piccolo uccellino, con pazienza é riuscito a farci camminare chilometri nella giungla, ci ha spiegato molto sulla flora e fauna. Bravissimo a far video e foto con i nostri telefoni col suo binocolo e cavalletto che si portava sempre appresso, queste foto sono dei magnifici ricordi. TRC non é un hotel, é un centro di ricerca per le are, in mezzo ad una foresta ed a ore dal primo centro abitato, perciò non avevamo delle grandi aspettative ne sul cibo ne sull'alloggio Read all

This place is a treat!! Incredible flora & fauna, food and service - the staff is quite attentive. Interesting research, with lots of potential. Visiting the Peruvian Amazon Rainforest is a must do! Read all

We had the most amazing time EVER at Refugio Amazonas, and I am so very glad I booked our stay here. Honestly, this is to date probably the best travel experience we have ever had and I will never forget our time in the Amazon here. First of all, the lodge is beautiful. Our room was lovely. The beds were comfy. The bathrooms are large. It is incredible waking up to the sounds of the jungle and falling asleep to the insects at night. We did have some insects in our room, and a rodent, and even a tarantula (non poisonous)! But it was part of the experience. The food was great and they prioritize native and local ingredients. My partner and I are both vegan and they took SUCH good care of us. The food was delicious, and we had ample vegan options every meal. Everything from the first email contacts with Katia to the transfers to the first night info session to the activities-- which I will get to in a second-- was incredible. It is a bit pricey, but everything is included and there is nothing you need to worry about, and it was so worth it. OK now for the best part-- the activities. Holy wow. First of all, we had the best guide EVER-- Juan Carlos. He was amazing. He is a bird expert, knows so much about the animals who live in the rainforest, the insects, the trees, the plant life, it was incredible. He also so clearly cared that everyone in our group had an amazing time. He took so many pictures for us, pointed out so many animals for us, and made sure we all enjoyed every moment. I can’t thank him enough because it made our time here so very special. We went on many activities that were amazing, and we saw so many animals— capybaras, howler monkeys, capuchin monkeys, so many incredible insects, frogs, tarantulas, so many many birds and butterflies. Every activity was amazing but the highlights were the macaw clay lick and the canopy tower. And we were super impressed and happy to hear about their commitment to conservation, protecting the animals, and supporting the native community nearby. There is so much I could say about our stay here but I would recommend a 3 night stay over 2 nights (so you can do more activities), and make sure you read the guides they send via email before you come so you pack correctly and know what to expect and bring--the guide includes everything so that there are no surprises, and we knew exactly what to expect, although our stay exceeded our expectations! I highly, highly recommend staying here, it was magical, it was a once in a life time adventure, and I will never forget it. I also want to shout out the manager of the lodge, I forgot her name, but she was incredible, as well as the service staff at meal times, who were so kind and helpful to point out what was vegan all of the time. I truly hope we can come back some day!! Read all

The lodge was kept very clean, and the staff paid close att to people's needs. It was very easy find activities and the guides were excellent with a genuine intended approach towards sustainability and environment longevity. Read all

A superb stay in a top class Lodge which gave a wonderful insight into the Amazon wildlife. Our guide was Juan Carlos who has incredible knowledge and a lovely sense of humour. The staff in the lodge were so friendly and the meals provided were something to look forward to. A wonderful experience! Read all

I traveled with my mom, who is elderly, and we were a little scared but decided to go for it. Upon arrival, our guide, Christian Herrera, was waiting for us. He was very friendly and had extensive knowledge of the area. The lodge is wonderful, 100% connected to nature. The food is delicious, and everything there is to do near the lodge is incredible. I highly recommend going to the tower at sunset and the macaw clay lick at dawn. Thank you guys for everything, the stay was a dream. Read all

This place totally stole the show! We came to Peru for Machu Picchu, but I think it’s safe to say Refugio Amazonas became the absolute highlight of our trip.​It manages to be as luxurious as a stay in the Amazon can be without feeling like too much hand-holding. The rooms don't have windows, which lets you be super close to nature. Sure, that means moths, but it also means drifting off to the peaceful sound of cicadas and waking up to howler monkeys. I honestly can't remember the last time I had such deep, peaceful sleep.​The food is another major plus; it's exceptionally fresh, especially considering it’s a buffet. You should absolutely check out their menu, too—it’s one of the most thoughtful and best-designed ones I’ve ever seen. Kevin hosted us at dinner most nights, and he was such great company and so mindful of my wife's dietary restrictions. It really adds to the experience when you feel that people genuinely care.​We also took advantage of the exceptional massage here. After a long trip, a massage by Kelly was exactly what the doctor ordered.​But the real star of the show is the activities and the guides. We got incredibly lucky with the very best: Juan Carlos. He was funny, great company, and extraordinarily knowledgeable. All the guides at Refugio Amazonas understand that it's not about just ticking a box but about living the experience. That’s why you might take 30 minutes longer to complete a hike—because you decided to spend some time watching Tamarins playing with each other. Jonathan was another guide we had a wonderful, very knowledgeable, and fun time with. We honestly just didn't want to leave and wish we could have stayed longer. Read all

We just finished three weeks in Peru and without a doubt Refugio Amazonas lodge was a real highlight of the trip. You need to know there is NO AC but honestly you don't need it at night in October, There's a ceiling fan and the bed was super comfortable with netting and additional fan within the bed area. The sounds of the jungle at night and Howler monkeys in the morning was great experience. The staff was excellent with a special mention for Paul our guide. He is an excellent Birder as well and can't thank him enough for over 110 new bird species during our four days there. The early morning Macaw clay lick experience with the boat ride in the dark was very cool. The buffet style meals were ok, make sure you bring shoes for mud and extra to walk around with in the lodge. Refugio provides boots for water on trails. See photos Read all

This place totally stole the show! We came to Peru for Machu Picchu, but I think it’s safe to say Refugio Amazonas became the absolute highlight of our trip.​It manages to be as luxurious as a stay in the Amazon can be without feeling like too much hand-holding. The rooms don't have windows, which lets you be super close to nature. Sure, that means moths, but it also means drifting off to the peaceful sound of cicadas and waking up to howler monkeys. I honestly can't remember the last time I had such deep, peaceful sleep.​The food is another major plus; it's exceptionally fresh, especially considering it’s a buffet. You should absolutely check out their menu, too—it’s one of the most thoughtful and best-designed ones I’ve ever seen. Kevin hosted us at dinner most nights, and he was such great company and so mindful of my wife's dietary restrictions. It really adds to the experience when you feel that people genuinely care.​We also took advantage of the exceptional massage here. After a long trip, a massage by Kelly was exactly what the doctor ordered.​But the real star of the show is the activities and the guides. We got incredibly lucky with the very best: Juan Carlos. He was funny, great company, and extraordinarily knowledgeable. All the guides at Refugio Amazonas understand that it's not about just ticking a box but about living the experience. That’s why you might take 30 minutes longer to complete a hike—because you decided to spend some time watching Tamarins playing with each other. Jonathan was another guide we had a wonderful, very knowledgeable, and fun time with. We honestly just didn't want to leave and wish we could have stayed longer. Nearby activities: We did the macaw clay lick, mammal clay lick, night walk, medicinal trail, canopy walk twice, and the oxbow lake. Safety: As safe as you can be in the Amazon rainforest Food & drinks: Excellent varied buffet lunches and dinners every day. Read all

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