Angels
are mentioned in almost every book of the Bible. 34 out
of the 66 books and letters, 118 times in 18 books of
the Old Testament. 115 times in 15 books of the New Testament.
They are mentioned more than the Devil and his demons
(fallen angels). Altogther the mention of Angels are found
almost 250 times in the scriptures.
Therefore
in no way we can say the bible is silent in this area
of angels and fallen angels. Life is full of angels to
our detriment or good. The ones in heaven are sent by
God to help us out and the kick out ones from creation
are here on earth doing mischeif and decieving the nations
with satan; so much so that even the church are unaware
of their evil deeds and manifestation. Paul tells us,
"To the intent that now unto the principalities and
powers in heavenly places might be known by the church
the manifold wisdom of God" (Ep 3:10).
Hopefully
these articles my shed some light on this subject:
Read
this first: Angelology

Read
this second: The
Sons of God 
Read
this third: Did
Angels marry women? 
Read
this fourth: Religions
started by Angels 
Fifth article: "They
weren't gone!"
By
the way, do you know that these devils (fallen angels)
don't want us to know that we, born again Christians,
are higher than them, click
here.