I didn’t say that they magically appeared just when they were and I don’t know why they are extraordinarily because the bible doesn’t say so that would just be my guess not scripture.
I would just think that they were born just like regular people give birth to giant size people today.
They were renowned for being ordinary?
Gigantism (today) is a rare and abnormal condition caused by a chromosomal nondisjunction that usually leads to premature death. There are ethnic groups like the Dinka of Africa that are very tall, and others like the Ba'mbuti that are very small, but they all remain in the natural phenotypic expression of the race.
The description of the Anakim, especially that given for Goliath, goes beyond that normal range of human phenotypic expression. I'm unaware of any physical description of the Nephilim, but the "im" ending of the nouns refers to something more than tribal differences. And in regard to the description of Goliath and his weapons, the cubit and the hands breath are subjective measurements, but there had to have been some standard for comparison in order for civil engineering to be accomplished, for worked stone to fit together in solid structures built without mortar (and these accomplishments existed, some with ruins still intact.)
If the Nephillim were indeed hybrids of 2 races, human and something else, and were themselves capable of reproduction, then their additions to the genome could persist in the human population, but most interspecies hybrids are infertile. Fertility is actually what differentiates between species.
The scriptures, when referring to creatures in the heavenly places, may not always be referring to angels or devils. This is an assumption that we make. We have biblical descriptions of Seraphim and Cherubim and assume that they are "classes" of angels because they are mentioned in scripture as creatures in the throne room of God, but the Bible does not elaborate upon the details of heaven's occupants, or if they have a common nature.
Scripture does speak to a variety of functions in the heavenly places:
12 For we do not wrestle against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this age, against spiritual
hosts of wickedness in the heavenly places. Ephesians 6:12
While these may all be angels of differing levels of authority and may share a common nature, scripture is silent to the extent that the information is relevant to the testimony of Jesus Christ. The few "pictures" we have of God's throne room (from scripture) and the creatures associated with it could be allegorical or visions intended to represent concepts, but they aren't fiction and describe a variety of physical appearance. A reasonable assumption would be that variations in appearance reflect differences in nature, as that's the case with species on Earth.
