It's something of a mystery, we don't know why all the Night Furies started to go extinct. Toothless is the smartest dragon I know though, so maybe they all just flew to a nicer place.

[ I hope.

Toothless is more than happy, despite the subject matter. With a switch of the prosthetic tailfin's angle, courtesy of Hiccup's pegleg-latch where a foot should be, the dragon tumbles and rolls through the sky encouraging Maleficent to play. Hiccup is more than enough of a good sport to be an enabler. ]

Are any of your friends around? I'd love to meet them.