Proverbs 30:18, 19 is not speaking spiritually, but rather of God's creative handiwork, which the churches have completely missed. Have you not read 1 Kings 4, that says of Solomon: "And God gave Solomon wisdom and discernment in very great measure and broadness of heart like the sand of the seashore. Solomon's wisdom surpassed the wisdom of all the people of the East (ancient Babylon) and all the wisdom of Egypt (who had a fundamental misunderstanding of the body, and of which their medical texts were heavily dosed with magic and superstition, with magical spells and incantations making up a major portion of their information, that may have contributed to the ' terrible diseases of Egypt ' [Deut 7:15] such as elephantitiasis, dysentery, smallpox, bubonic plague, ophthalmia). He was wiser than any other man.....He composed 3,000 proverbs and his songs numbered 1,005. He would speak about the trees, from the cedar in Lebanon to the hyssop that grows on the wall; he would speak about the animals, the birds, the creeping things (such as the arthropods or six legged and eight legged creatures that includes insects, spiders and crustaceans) People from all the nations came to hear Solomon's wisdom, including kings from all over the earth who had heard about his wisdom".(1 Kings 4:29-34)
At Psalms 104, the psalmist wrote: "How many your works are, O Jehovah ! You have made all of them in wisdom. The earth is full of what you have made".(Ps 104:24) When all of our senses, sight, touch, smell, hearing, taste, are employed to carefully examine Jehovah's creative handiwork, we are astounded at how critically precise they function.
For example, the eagle's eyesight is so keen, being some 4 to 8 times stronger than a human's, that it can spot a rabbit half-hidden in the grass from about 1.9 miles or 3.2 kilometers.(source: Eagles by Rebecca Grambo, pub in 1999)
If we had the same capable eyesight as an eagle's, we could see an ant crawling on the ground from the roof of a 10-story building. Objects in our line of sight would appear magnified, and everything would be brilliantly colored, rendered in an inconceivable array of shades.(source: Live Science, Feb 24, 2012, article: What If Humans Had Eagle Vision)
According to William Hodos, a professor emeritus at the University of Maryland who has studied the visual acuity of birds for over 40 years noted that eagle's retinas are more densely coated with light-detecting cells called cones than human retinas (about 5 times more), enhancing their power to resolve fine details just as a higher pixel density reveals details that otherwise would remain hidden.
And eagles have a much deeper fovea, a cone-rich structure in the back of the eyes of both humans and eagles, that detects light from the center of our visual field. William Hodos states: "Our fovea is a little shell or bowl, while in a hawk or eagle it's a convex pit. Some investigators think this fovea allows the eyes to act like a telephoto lens, giving them extra magnification in the center of their field of view". Eagles have a 340 degrees of view in comparison to our 180 degrees of view, allowing them to see almost everywhere at once with a little twisting of the head.
On top of the sharp focus and central magnifier, eagles also have superior color vision. They see colors more vivid than we do, can discriminate between more subtle shades, and can see ultraviolet light - an ability that helps them detect the UV-reflecting urine trails of small prey, such as mice, rabbits, rats, etc.
Or of serpents or snakes, of which there are some 3,000 different species, they are amazingly capable of climbing trees without any limbs, move at a fast speeds (such as the black mumba reaching 12 mph or the sidewinder that travels up to 18 mph - source: Smithsonian Channel) and are able to swallow prey larger than the size of their mouths, due to unhinging their jaws. One reticulated python swallowed a full grown antelope, horns and all, over a period of several hours, causing its mid-section to be severely distended, as well as a woman in Jakarta, Indonesia recently.
At Isaiah 14:29 and 30:6, it speaks of the "flying fiery snake". This snake is found in the jungles of south and southeast Asia, whereby it climbs to a high point from which to launch itself (such as a tree), and while in the air, flattens its body so that it can travel a distance of some 300 feet or about the length of a football field, hoping to catch its prey unaware.
They smell their prey with their forked tongue, that signals to them to either go left or right for its prey. They have been given exceptional camouflaged by Jehovah God, such as the diamond-backed rattler of Arizona, U.S.A. desert, that a person or prey cannot easily see because it is so well camouflaged. Or the sidewinder, a venomous pit viper, that buries itself in the sand so that only its eyes are visible, waiting for passing prey, located in the desert regions of the southwestern United States and northwestern Mexico.
How true what Nehemiah said in prayer to Jehovah: "You alone are Jehovah; you made the heavens, yes, the heaven of the heavens and all their army, the earth and all that is in it, the seas and all that is in them. And you preserve all of them alive, and the army of the heavens (both the angels and celestial bodies) are bowing down to you".(Neh 9:6; see also Rev 4:11)