HasFlags always returns true for None (0) value in enum

Question

This is the enum definition:

[Flags]
enum Animals
{
    None = 0,
    Dog = 1,
    Cat = 2,
    Horse = 4,
    Zebra = 8,
}

Now, given the

Answer 1

HasFlag is effectively this:

HasFlag = (GivenFlag & Value) == GivenFlag;

//"Anything" AND 0 == 0  --> always true