An Angel is humanoid. It can see invisible creatures.
He answered and said unto them, he that soweth the good seed is the Son of man; the field is the world, and the good seed are the children of the kingdom; but the weeds are the children of the wicked one; the enemy that sowed them is the devil; the harvest is the end of the world; and the reapers are the angels. As therefore the weeds are gathered and burned in the fire; so shall it be in the end of this world. ... So shall it be at the end of the world; the angels shall come forth, and sever the wicked from among the just, and shall cast them into the furnace of fire; there shall be wailing and gnashing of teeth.
The Gospel According to Matthew, 13:37-42, 49-50