Hiccup and Toothless were flying over the sea, but found an island. The island was small and abandand. Curiosity got the better of them and they landed there

Toothless started sniffing around and Hiccup walked around a bit... but he spotted a cave. Inside, there were feathers and a nest, clearly a dragons nest

But... He found an actual dragon egg there! He looked around the island some more, making sure it was empty and then he took the egg and took it to his mother, Valka who is an expert with dragons

Hiccup: Mom! Mom, you'll never believe what I found!

Hiccup yelled happly. Toothless followed him, sniffing the egg in Hiccups arms, tilting his head in confusion