Costa Rica’s massive biodiversity certainly extends to snakes. There are 141 species slithering, swimming, and burrowing through the country’s varied habitats. Considering the fact that all of these species are piled into a fairly tiny country, recording snake videos on my camera traps should be a common occurrence.
Unfortunately for me and my fellow snake lovers, this is not the case. Of the tens of thousands of wildlife videos that I’ve recorded over the last several years, less than 50 have featured these scaley legless wonders. So, what gives?
My camera traps rely on a passive infrared detector to tell them when to begin recording videos. This sensor is triggered by two things: motion and variance in temperature. When the sensor detects movement in the area in front of the camera it begins recording. It is easier for the camera to detect larger animals than smaller animals.
So, when a giant animal, like a tapir, passes by you’d better believe the camera is recording it. When a small snake makes its way in front of the camera, there’s a good chance it will miss it. I also suspect that the slow, deliberate nature of most snakes’ locomotion doesn’t help. As for the variance in temperature, generally snakes are going to be approximately the same temperature as their environment, so that doesn’t help much.
Despite these obstacles, every once in a while, I will come across a snake video while reviewing an SD card plucked from a camera hidden in the wilderness. Sometimes it’s due to how the camera is placed. If I have it focused tightly on a nearby location, like a puddle of water, a snake’s movement (usually a large snake) is enough to trigger the camera.
The other three reasons the camera records a snake are:
- Some bigger animal triggers the camera with its movement and the snake just happens to be there
- The snake is eating something, causing a sufficient ruckus to trigger the camera
- Some larger animal is eating the snake
I record indigo snakes (sabanera real – en Español) every now and then in Guanacaste. They’re often big enough to trigger the camera themselves. I’ve recorded a black threadsnake (culebra hilo de bosque seco) twice.
Both times being eaten. Once by a pacific screech owl and once by a great kiskadee. I recorded a green-headed racer (corredora cabeza verde) taking a drink from a puddle, a neotropical ratsnake (ratonera) eating some frogs, a tiger ratsnake (mica) touching noses with a coati, and a Central American rattlesnake (cascabel) being dragged away by an ocelot.
Sometimes I can’t tell which species of snake is starring in the show. I have recorded an unknown snake nearly biting a raccoon, some very long snake duking it out with an opossum, and an unknown, very skinny, snake getting absolutely thrashed and eaten by another opossum.
Snake videos are so few and far between that it’s always a fun surprise to get one. Just imagine the little hoot of joy I let out when I came across the clips in the video below.
About the Author
Vincent Losasso, founder of Guanacaste Wildlife Monitoring, is a biologist who works with camera traps throughout Costa Rica. Learn more about his projects on facebook or instagram. You can also email him at: firstname.lastname@example.org
Kwa hakika, aina nyingi za wanyama katika Kosta Rika zinatia ndani nyoka. Kuna spishi 141 zinazotambaa, kuogelea, na kuchimba mashimo katika maeneo mbalimbali ya nchi hiyo. Kwa kuzingatia ukweli kwamba spishi hizi zote zimejikusanya katika nchi ndogo sana, kurekodi video za nyoka kwenye mitego yangu ya kamera inapaswa kuwa jambo la kawaida. Kwa kusikitisha kwangu na kwa wenzangu wapenzi wa nyoka, sivyo ilivyo. Kati ya maelfu ya video za wanyama wa porini ambazo nimeorodhesha katika miaka michache iliyopita, chini ya 50 zimeonyesha maajabu haya yasiyo na miguu. Kwa hiyo, ni nini kinachotoa? Mtego wangu wa kamera unategemea kifaa cha kugundua infrared cha kuwaambia ni lini waanze kurekodi video. Sensorer hii huchochewa na mambo mawili: mwendo na tofauti ya joto. Wakati sensor hugundua harakati katika eneo mbele ya kamera huanza kurekodi. Ni rahisi kwa kamera kugundua wanyama wakubwa kuliko wanyama wadogo. Kwa hiyo, mnyama mkubwa, kama tapir, anapopita karibu nawe, ni afadhali uamini kwamba kamera inaweka picha. Nyoka mdogo anapojitambulisha mbele ya kamera, kuna uwezekano mkubwa kwamba atampoteza. Pia ninashuku kwamba mwendo wa polepole, wa makusudi wa nyoka wengi hausaidii. Kuhusu tofauti ya joto, kwa ujumla nyoka watakuwa na joto sawa na mazingira yao, kwa hiyo hiyo haisaidii sana. "Licha ya vikwazo hivi, mara kwa mara, nitakutana na video ya nyoka wakati wa kukagua kadi ya SD iliyochukuliwa kutoka kwa kamera iliyofichwa katika jangwa. """ Wakati mwingine ni kwa sababu ya jinsi kamera imewekwa. Ikiwa nimeweka lengo la karibu kwenye eneo la karibu, kama bwawa la maji, mwendo wa nyoka (kwa kawaida nyoka mkubwa) ni wa kutosha kuamsha kamera. "Kama ilivyoelezwa hapo juu, ""Mnyama fulani mkubwa zaidi huamsha kamera kwa mwendo wake na nyoka huyo hutokea kuwapo tu - Nyoka anakula kitu, na kusababisha kelele ya kutosha kuamsha kamera - Mnyama fulani mkubwa zaidi anakula nyoka." Wao ni mara nyingi kubwa ya kutosha kuamsha kamera wenyewe. Nimekuwa kurekodi nyeusi threadsnake (culebra hilo de bosque seco) mara mbili. Mara zote mbili walikula. Mara moja na pacific screech owl na mara moja na kiskadee kubwa. "Niliona mnyama mwenye kichwa cha kijani (corredora cabeza verde) akinywa maji kwenye kidimbwi, nyoka anayeitwa ratonera akila vyura, nyoka anayeitwa tiger (mica) akigusa pua kwa kutumia pua ya coati, na nyoka anayeitwa cascabel akivutwa na nyoka anayeitwa ocelot.""" Nyakati nyingine siwezi kujua ni aina gani ya nyoka anayeshiriki katika kipindi hicho. "Nimeona nyoka asiyejulikana karibu akimchoma raccoon, nyoka mrefu sana akipigana na opossum, na nyoka asiyejulikana, mwembamba sana akishambuliwa na kula na opossum nyingine.""" Video za nyoka ni chache sana na mbali kati ya kwamba ni daima mshangao wa kufurahisha kupata moja. Hebu wazia jinsi nilivyofurahi nilipogundua video zilizo hapa chini. Vincent Losasso, mwanzilishi wa Guanacaste Wildlife Monitoring, ni mwanabiolojia ambaye anafanya kazi na mitego ya kamera kote Costa Rica. Jifunze zaidi juu ya miradi yake kwenye facebook au instagram. Unaweza pia kumtumia barua pepe kwa: jina la kwanza. jina la mwisho@example.org