sentence construction - The giraffe ear is fell off

"The giraffe ear is fell off."

my son told me.

One of the ear of giraffe wall sticker is fell off.

What do we say for this? The rest (giraffe's body) is still sticking on the wall.

Only part of its ear is dropping.

Answer

The giraffe's ear is falling off.

or

The giraffe's ear has fallen off.

You can also say:

The giraffe's ear is coming off.

or

The giraffe's ear has come off.

To be accurate, you wouldn't say something has fallen off (or come off) unless it was completely separated from whatever it was attached to. But kids are not always as precise with their language.

(Edit): Also (as per BruceWayne's comment)

The giraffe's ear fell off.

The giraffe's ear came off.