1- Dragons are very large in size.

2- They were found in ancient periods.

3- They have very sharp teeth and a long tounge.

4- Some dragons lay out fire from their mouth.

5- Some of them have wings which help them to fly.

6- They are of many kind sizes, shapes and colour.

7- They have many types of spieces and like to live in caves. 
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 expect that when most people think of a dragon, they think of a monster.
A terrifying beast that tries to eat a princess, finally to be vanquished by a valiant knight. Or, a cunning serpent hoarding a mass of treasure, finally to be vanquished by a valiant knight.The vanquishing part is guaranteed.I have never seen dragons that way.
(I've only just come to realise that this is probably due to the stories my father told me as a child, with three dragons in them: one organised and slightly gruff, one mysterious and magical, one with a paw always raised in greeting — but all very friendly.)When I think of a dragon, I think of something wise and ancient and powerful. A creature that has seen so much and felt so much and could teach us so much. Someone to be listened to and talked to, but big enough and fearsome enough to bring down your enemies.