Can you solve this picture maths equation?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Through your logical capabilities, can you make 7 an even?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

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

Next Number in the Series,

5, 16, 49, 104, ?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?