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We assume our guides are taking us to a thick forest and are surprised when , after an hour 's journey , we stop alongside some fallow cotton fields-bare dirt everywhere and no trees . Unlike the front-fanged elapids and viperids , the venomous colubrids are rear-fanged snakes , which must hang on and chew when they bite to inject any venom . My work in the high-latitude North Pacific is mainly focused on learning the sequence of molluscan faunas that developed in response to climatic , tectonic and oceanographic changes during the Cenozoic . In addition to learning scientific methodology and marine biology concepts , students gain an appreciation for and sense of stewardship toward their local marine environment . Most araneids are nocturnal , hiding during the day , building their webs at night , and eating the web before dawn . Unlike gobies , rice fish always stay in the water , suggesting that the vine snakes were catching their meals directly from the river . In the wild , Burmese vine snakes hunt during the day . Nephila and Nephilengys build huge orb webs : those of Nephila are made of yellow or golden silk and are built in vegetation , whereas those of Nephilengys are built against tree trunks , rock faces , and walls . Some credit agencies expressed reluctance in turning their debt over to FMS during our review . A - Snails are only active during the day when it is cool and / or damp .