It said in Revelations that a great red dragon, otherwise known as Satan will wait for the baby to come out of the woman, to devour it. So we know that God created all living things, but I'm not sure if dragons, dinasours, insects, flies are part of His creation.
This is the same one referred to as the serpent in Genesis 3. Remember that God foretold the destiny of his offspring in Genesis 3:15. In the beginning this one is belittled, because humans were strong in righteousness and could simply squash a pesky little snake. However, in the end the human has grown so weak (Isaiah 6:8-13) and this crafty one so established over them (1 John 5:19) that he is depicted as having a greater form, a serpent of fearsome strength, like a dragon (Romans 8:20-22).
Simply, the serpent is more cunning than the children of light (Luke 16:8), and the corruption of the faith through false doctrines (2 Peter 2:1-2, 1 John 4:1-3) has weakened the attitude of the children of light (Matthew 24:24, John 12:35) so that they do not press deep into faith and take hold of the fullness of kingdom power (
Proverbs 24:10).
Revelation is showing that this futility (Romans 8:20) doesn't completely destroy the world (Revelation 5:5, Revelation 21:4).
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Lift up your heads, O gates, and be lifted up, you everlasting doors: that the King of glory may come in.
“Who is this King of glory?”
Adonai strong and mighty, Adonai mighty in battle!
Lift up your heads, O gates, and lift them up, you everlasting doors: that the King of glory may come in.
“Who is this King of glory?”
Adonai-Tzva’ot—He is the King of glory!
(Selah)
Psalms 24:7-10