If by Dragon fish you mean Arowana then, no it is not normal for one to be swimming upside down. They grow into really big fish (over 40 inches long) so I hope you have a really big tank more than 8 feet long to house it in.
When their swimming upside down its usually a sign that their dying
No!
If your fish cannot swim upright, is swimming on its side or upside down, it most likely has a swim bladder problem.
Dragon - 2004 Dragon's Rainy Day Fun Dragon's Upside Down House 3-5 was released on: USA: 1 March 2009
No it is not normal for a praying mantis to hang upside down
It's not swimming. It's dead. Sorry :(
A koi would generally be depicted swimming upstream, not down. According to Japanese legend, once a koi swims over the falls at the 'Dragon Gate on the Yellow River' it would be transformed into a dragon. As such, the koi swimming upstream is a symbol of Ambition.
If your ferret eats food upside down only, I wouldn't think it would be normal, check his teeth and gums for any signs of problems
Keeping Alice and Con amused
They descend over a mile underwater to feed, swimming most of the way upside-down!
Well, without the brain then your eyesight would be upside down. It's weird, your brain flips your eyesight and you will start seeing normal things.
No but it has a 90 degree tilt if you know what I mean!