00:00 Humans have a natural fear and tendency to kill snakes, even though most snakes are not venomous and pose little threat to humans.

04:55 Humans have a natural fear and tendency to kill snakes, even though most snakes are not venomous and pose little threat to humans.

09:41 Snakes have senses similar to humans, but adjusted slightly differently, including the ability to hear through specialized bones in their skull and see in low light or with infrared vision, as well as a strong sense of smell; their digestive tract runs along the length of their body and their metabolic rate increases significantly when digesting large prey.

14:37 Snakes can extend their trachea out of their mouth to breathe, they don't have a diaphragm and breathe by widening and narrowing their ribcage, and they have an apnea where they don't breathe at all between breath cycles.

19:54 Snakes molt their skin every few days to a few months, and they can continue growing throughout their entire lives. They move using a serpentine motion, which allows them to propel themselves forward quickly on land and in water.

24:41 Snakes have different types of locomotion, including side winding, caterpillar-like movement, and concertina motion, which they use for climbing trees. The anaconda is the largest snake and is a great swimmer, using its eyes and nose on the tops of its head to keep an eye on prey while submerged in water.

29:35 The discovery of a 56 million year old species of giant snake called the Titanoboa, which grew to about 40 feet long and weighed as much as a rhinoceros, was a big deal because intact snake skulls are rare and it was the king of the Colombian jungle.

34:29 Venomous snakes produce their own poison, while some snakes that eat poisonous prey collect and store the poison, and venom can have aglutinins and anticoagulants that affect blood clotting, and boas and anacondas constrict their prey by wrapping around them and crushing their lungs and heart.

39:08 Female snakes release pheromones to signal that they are ready to mate, and male snakes follow the scent trail until they catch up with the female, where they engage in courtship behavior before mating.

44:29 The death adder in Australia and New Guinea is known for its triangular shaped head and its ability to kill other snakes.

49:17 The inland Taipan, or fierce snake, has the most toxic venom in the world, with just one bite containing enough venom to kill about 100 human beings or five million guinea pigs, although encounters with this snake are rare and there are no recorded fatalities.