What month of the year has 28 days?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

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 start the fire using two pieces of wood?

Can you Find and name the hidden bird in the picture below ?

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

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

If you say my name, I will no longer exist. What am I?