Do they have rings on their fingers and bells on their toes.
(And a bone through their nose, oh ho)
These fallen angels corrupted ALL FLESH except for Noah. Noah was perfect in his generations. Whatever got on the Ark was NOT of God and His creation. Dinosaurs didn't make it on the Ark. Since all flesh was corrupt except Noah, His wife and children carried the seed corrupted by demons. According to the Septuagint, Nimrod was the first Giant mentioned after the Flood. They went on to populate Canaan so the Spies that entered Canaan told Joshua we were grasshoppers in their eyes and brought back one cluster of grapes on a stick carried by 2 men. A careful study of giants in the Bible reveals about 8-10 tribes of Giants throughout the Canaan land. Satan knew the plan of God to bring Abraham's descendants back to Canaan when the left Egypt as slaves, so he had 400 years to dig in with Giants running things in Canaan. Amos 2:9 speaks of God destroying the Amorites as tall as trees. It also speaks of killing their "fruit" which is their offspring. This upsets some when Scripture speaks of Saul, Joshua, and others being told by God to destroy everything, even women children and even the animals in a certain place. God was destroying the corrupted seed in that place. These Nephilim had the power to corrupt even the animals( aka dinosaurs). God didn't want even the dogs and horses to reproduce. They taught the women they took to be witches and cast spells in the occult.
I don't remember any scriptures that say they wore bells and rings, but they very well could have. They may have worn bones in their noses because they were reported to be cannibals. Remember when Noah left the Ark, God told him to not eat flesh with its life, that is, its blood. (Gen 9:4) It is believed they were so large they could chase down an animal like a buffalo and pick it up, rip off a leg, and eat it while they were still running. God doesn't want you to eat things still alive. Many of the rules God made after Gen 6 was aimed at what the Nephalim taught people to do.