Angel is just like angel as an angel needs no food, no sleep, no rest and no other stuffs what the others creatures need. The angels are created to pray to Allah and to obey His commands only. The angels never violate His commands and they have no power to do such. The angels are only to obey on Allah's commands at every stage of their life. And the angels also do so regularly.
We can not but believe in angel. The angel is of light and the angel does like light as the angel is created to do so, also the angel is given power to CHANGE their FORM any time (in need) from one to another.