Buddhist missionaries arrived from India in 250 BC during the time period of King Devanampiyatissa. The kings of the island, and eventually most of the Sinhalese people, became Buddhists. Legend has it that Buddha visited the island three times.
The island was subject to waves of European settlement and eventually colonisation. The Portuguese in the 16th and 17th centuries, the Dutch in the 17th and 18th centuries, and lastly the British from 1796 to 1948. The British traded as the others had done, but also developed plantations of coffee and tea. Tea was planted after a fungus destroyed the coffee plantations in 1869. The tea plantations were the basis of Sri Lankan prosperity for a hundred years. Lastly, rubber plantations were started in the early 20th century. In 1965, Ceylon became the world's leading exporter of tea, with 200,000 tonnes of tea being shipped internationally annually.
Independence from the British was got in 1948, together with Dominion status in the British Commonwealth of Nations. In 1972, Ceylon changed its name officially to the Republic of Sri Lanka, and is still a member of the Commonwealth.
In 2009 came the end of a long Sri Lankan Civil War between Sinhalese and Tamils. Since then tourism has rapidly grown as a source of foreign investment and currency.
The Sri Lanka flag is also known as the Lion flag because of the Lion on it. The Lion is holding a sword in its right paw. There is a crimson background with four leaves in each corner. There is a yellow border. On the left of the flag there are the colors green and saffron.
The lion represents bravery. The four leaves represent Karuna, Meththa, Muditha and Upeksha. The orange stripe represents the Sri Lankan Tamils and the green stripe represents the Sri Lankan Moors.
Sri Lanka has 9 provinces.
On April 21, 2019, bombings hit churches and hotels and left at least 290 people dead and 500 injured in the cities of
cities of Colombo, Negombo and Batticaloa. According to officials a Sri Lankan group called "National Thowheed Jamath" was behind the attacks.
Most of those killed were Sri Lankan nationals, but there were also thirty-one foreigners who died, including
eight British, eight Indian, two Turkish, two Australian, one Bangladeshi, one Portuguese and four American nationals.
Reptile
Reptile is the common name for one of the main groups of land vertebrates. It is not used so much by biologists, who use more accurate terms.
The name "reptile" comes from Latin and means "one who creeps". All living reptile species are cold blooded, have scaly skin, and lay cleidoic eggs. They excrete uric acid (instead of urea), and have a cloaca. A cloaca is a shared opening for the anus, urinary tract and reproductive ducts. Reptiles also share an arrangement of the heart and major blood vessels which is different from that of mammals.
Many important groups of reptiles are now extinct, for example the mosasaurs. We used to say the dinosaurs were extinct, but they survive in the form of their feathered descendants (birds). Ancient reptiles that do survive include the turtles, the crocodiles and the Tuatara, the lone survivor of its group. The great majority of present-day reptiles are snakes and lizards.
The study of living reptiles is called "herpetology".
Some reptiles are more closely related to birds than they are to other reptiles. Crocodiles are more closely related to birds than they are to lizards. Theropod dinosaurs are even more closely related, because birds evolved from them.
Cladistic writers prefer a more unified (monophyletic) grouping. This puts the birds (over 10,000 species) with what people normally call reptiles. (see Sauropsida)
Reptilia is an evolutionary grade rather than a clade. The main reason is that the term 'reptile' does not include birds, the descendents of theropod dinosaurs. Another reason is that the word 'reptile' is misleading because many extinct types were very different from living reptiles.
So instead of Reptilia as a taxonomic class, today many experts use Class Sauropsida (which includes all reptiles and birds, living and extinct). Class Synapsida includes mammals and all their forebears. "Reptile" is still the usual informal term to describe living snakes and lizards. Mammals are a genuine clade, and so Mammalia is still the taxonomic term.
Since reptiles are not monophyletic, reclassifying them is one of the key aims of researchers. Some taxonomists, such as Benton, make Sauropsida and Synapsida as class-level taxa. The two groups split in the Carboniferous, from stem-group Amniotes (the early tetrapods, which laid cleidoic eggs).
A membrane forms an inner eyelid in reptiles and birds. Whitish or translucent, it can be drawn across the eye to protect it from dust and keep it moist. It is called the "nictitating membrane".
Reptiles can live in large and small sizes. Their land sizes can be both bigger and smaller than mammals. Titanosaurs were the largest land reptiles, and the smallest land reptile is a chameleon 13.5mm long.
Snake
Snakes are reptiles. They are part of the order Squamata. They are carnivores, with long narrow bodies and no legs. There are at least 20 families, about 500 genera and 3,400 species of snake.
The earliest known fossils are from the Jurassic period. This was between 143 and 167 million years ago.
Their long, slender body has some special features. They have overlapping scales which protect them, and help them move and climb trees. The scales have colours which may be camouflage or warning colours.
Many species have skulls with more joints than the skulls of their lizard ancestors. This allows the snakes to swallow prey much larger than their heads. In their narrow bodies, snakes' paired organs (such as kidneys) appear one in front of the other instead of side by side. Most have only one working lung. Some species have kept a pelvic girdle with a pair of vestigial claws on either side of the cloaca. They have no eyelids or external ears. They can hiss, but otherwise make no vocal sounds.
They are very mobile in their own way. Most of them live in the tropics. Few snake species live beyond the Tropic of Cancer or Tropic of Capricorn, and only one species, the common viper ("Vipera berus") lives beyond the Arctic Circle. They can see well enough, and they can taste scents with their tongues by flicking them in and out. They are very sensitive to vibrations in the ground. Some snakes can sense warm-blooded animals by thermal infrared.
Most snakes live on the ground, and in the trees. Others live in the water, and a few live under the soil. Like other reptiles, snakes are ectotherms. They control their body temperature by moving in and out of the direct sunshine. That is why they are rare in cold places.
Snakes range in size from the tiny, 10.4 cm (4 inch)-long thread snake to the reticulated python of in length. The extinct snake "Titanoboa" was long.
Snakes are thought to have evolved from lizards. The earliest snake fossils are from the Lower Cretaceous. A wide range of snakes appeared during the Paleocene period ("c" 66 to 56 million years ago).
The Squamata are definitely a monophyletic group: it is a sister group to the Tuatara. Judged by their fossil record, the squamates were present in the Mesozoic, but had a minor place in the land ecology. Three of the six lines are recorded first in the Upper Jurassic, the others in the Cretaceous. Probably all, certainly the lizards, arose earlier in the Jurassic. The Mosasaurs of the Upper Cretaceous were by far the most successful of all the lizards, becoming the top predator in their ecosystem.
Although snakes and lizards look very different, "neither is a proper clade". Snakes did descend from early lizards, not once, but a number of times.
There is a monophyletic clade within the Squamata. It is the Toxicofera. It includes all venomous snakes and lizards, and many related non-venomous species. The evidence for this is in recent molecular analyses.