When 99 is considered higher than 100?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

The Little ant seems to be always confused. Do you know why?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

A charming young lady was approached by a kind looking old woman in a restaurant. The old woman said to her, 'You look exactly like my younger daughter. Sadly she passed away a couple of months back. Could you do me a favor and say 'Goodbye, mother' with a kind smile on your face when I leave?

The young lady agreed for the same and said, 'Goodbye, mother' when the old woman left. Soon after, she got the most disengaging shock of her life.

Can you guess what the shock was?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

How can you write nineteen in a manner that if we take out one, it becomes twenty?