Which is the correct shadow of the bird?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

I know a nine-letter word having only one vowel.
Do you ?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?