Snakes

 

This week will look at snakes the legless reptiles, they are far more diverse and surprising than most people realise so here is some information about them.

It is believed that they evolved from four‑limbed lizards around 100 million years ago. Some species, like pythons and boas, still carry tiny vestigial leg bones — evolutionary leftovers.

They can be found everywhere except Ireland, Iceland, New Zealand, and the polar regions.

They live in some amazing habitats such as forests, deserts, grasslands, mountains but only up to 16,000 feet, oceans and even 800 feet underwater of Australia.

They don’t hear airborne sound well but detect ground vibrations with great sensitivity. Their eyes are covered by a transparent scale called a spectacle, which sheds with the rest of the skin. Many species use heat‑sensing pits to detect warm‑blooded prey.

When it comes to moving, they use several locomotion styles depending on the terrain there is the classic slithering which is called lateral undulation, then there is rectilinear movement which is for slow, stalking. Some can glide from tree-to-tree others are excellent swimmers and when on loose sand the do something called sidewinding.

Do you know what they eat, well they are carnivores so small snakes eat insects, frogs, lizards and rodents. Larger ones can eat deer, antelope, capybaras and even jaguars, not something I have ever they would eat. Mostly because they swallow prey whole thanks to flexible jaws. Also, some can go two years without eating due to extremely slow metabolism.

Most snakes lay eggs, but some give birth to live young, babies are independent from birth needing no parental care. A few species (like pythons and king cobras) guard their nests. Some females can store sperm for years. The Brahminy blind snake is all‑female and reproduces without males.

There are about 725 venomous species, and 250 can kill a human with one bite.

The most dangerous snake globally (in terms of human deaths) is the saw‑scaled viper.

Australia’s inland taipan is the most venomous by toxicity but rarely kills because it avoids humans.

About one‑third of adults have some level of snake fear. Scientists believe this may be an evolutionary instinct — early humans who avoided snakes were more likely to survive.