How is a Mayu Bird actually a bird?

[CM30]

I understand why you'd say, call the Robo Bird one, it's obviously got an avian appearance.

But these things?

Look more like bats to me. They make more sense as bats too, unless you like to believe birds with suspiciously large fans just hover around in Arabian ghost towns...

Anyone else not get this?

 

[ChanceTime]

I'd love to see a nature documentary about these things.

"Here we see the graceful Mayu Bird, with its lips, eyebrows and teeth..."

 

[Just a Wario Fan]

I always tought they are a kind of giant insects.