Presentation on theme: "Stealths of the Shadows"— Presentation transcript:
1Stealths of the Shadows SNAKESStealths of the Shadows
2Safety in the field is imperative. Never step over a log Safety in the field is imperative. Never step over a log. Snakes often rest coiled up next to objects, and you may get bitten when your foot startles them.
3Instead, always step on logs then take a stride off.
4In Sri Lanka, cobra charmers are plentiful In Sri Lanka, cobra charmers are plentiful. BTW, just where is that big snake going???
15Tommygoff in Rabinowitz’s wrecked airplane Tommygoff in Rabinowitz’s wrecked airplane. Orlena Tampira & Ryan Englebrecht looking into the hole (bottom left is what they saw; Dr. Bob leaning inside plane to take the photo of the 6 ft fer-de-lance on the right).
18Eyelash Palm-Pitviper, Bothriechis schlegelii - Belize Photos by Marceau Ratard
19Eyelash Palm-Pitviper, Bothriechis schlegelii, juvenile Eyelash Palm-Pitviper, Bothriechis schlegelii, juvenile. This species often rests flat against tree trunks in Belize forests. photo by Thomas Eimermacher
25Saw-scale Viper, Echis coloratus – Note that it is lying with its sides curved & in contact. This allows it to rub its sides together and make a loud hissing sound. Africa
26African Horned Viper, Cerastes cerastes: Convergent with the American Sidewinder Rattlesnake due to use of desert habitat; nestles down in the sand and ambushes prey.
27Velvety-Green Night Adder, Causus resinus – Africa - not all vipers look like venomous snakes.
28Bibron’s Burrowing Asp, Atractaspis bibronii – Africa – feed on rodents in burrows; have the ability to move the fangs out of the mouth, pointing to the rear, an adaptation for envenomating a number of mice as they scurry away and past the predator in the burrow. Don’t try to pick them up behind the head – they can bite backwards! Photo by Harry W. Greene.
29HOW CAN ONE TELL A CORAL SNAKE FROM ITS “MIMICS”? In the U.S. and Belize, remember this poem: Red and yellow kill a fellow, red and black friend of Jack. This means that if red rings touch yellow rings, it is venomous; if red rings touch black rings, it is not venomous.Warning: This does not work everywhere – check out some of the venomous coral snakes in the following slides.
30Are all red, yellow (tan), and black non-venomous snakes actually mimicing venomous coral snakes? That is the theory, but there is a strong possibility that this color combination is cryptic. Remember, they mostly live underground. Also, when lying still, they tend to be obvious, but when they are 1) in the shade or 2) begin to move, they are extremely cryptic.
31Non-venomous Milk Snake, Lampropeltis triangulum, from Cockscomb, Belize – 2002.
32False Coral, Erythrolamprus mimus, a mildly venomous coral snake mimic.
41Black Mamba, Dendroaspis polylepis – note the venom drops – Africa Black Mamba, Dendroaspis polylepis – note the venom drops – Africa. The pink skin is possibly the result of a viper bite.
42In the south Pacific, there is an octopus that mimics a sea snake
43Mussurana, Clelia clelia: As an adult, mussurana’s eat snakes; as juveniles, they eat lizards (see a specimen extruding from a wound in this dead specimen’s side). As an adult it is very dark, but as a juvenile, it looks a bit like a coral snake.
88Tropidodryas striaticeps – Brazil Tropidodryas striaticeps – Brazil. This aggressive snake has an interesting tail tip (attracting prey?) and enlarged scales on its rear-lateral dorsal scales (for rubbing and making sound).
89Some snakes, especially those with brightly colored bellies, will hide the head and lift the curled tail when confronted by a predator.
90Some snakes will avoid predation by “playing dead” (letisimulating).
95Anacondas mating – often, more than one smaller male is in pursuit Anacondas mating – often, more than one smaller male is in pursuit! The female is the biggun in the middle. National Geographic Magazine
96Emerald Tree Boa, Corallus caninus - note the heat receptors on the lips – South America
97Cook’s Tree Boa, Corallus ruschenbergii - Trinidad