The Hoopoe was introduced in Birds of the Bible – Hoopoe and would like to add more information about the Hoopoe.

The Hoopoes are in the BUCEROTIFORMES Order which includes Hoopoes, Wood Hoopoes, Hornbills and Ground Hornbills. I have revised this information since the 1st article. Wikipedia (now updated) had them with the woodpeckers, but the records I am using from the I.O.C. (2009) places them with the hornbills and in the Upupidae Family

The three Upupidae members are the Eurasian, African, and Madagascar Hoopoes. (Some say these three are basically the same.) The Wood Hoopoes are in the Phoeniculidae Family that consists of the Forest, White-headed, Green, Black-billed, Violet and Grant’s Wood Hoopoes. That family also has the Black, Common and Abyssinian Scimitarbills.
“The Hoopoe is a medium sized bird, 25–32 cm (9.8-12.6 in) long, with a 44–48 cm (17.3-19 in) wingspan weighing 46-89 g (1.6-3.1 oz). The species is highly distinctive, with a long, thin tapering bill that is black with a fawn base. The strengthened musculature of the head allows the bill to be opened when probing inside the soil. The hoopoe has broad and rounded wings capable of strong flight; these are larger in the northern migratory subspecies. The Hoopoe has a characteristic undulating flight, which is like that of a giant butterfly, caused by the wings half closing at the end of each beat or short sequence of beats.” (Wikipedia) It appears that the Lord has created this bird with just what it needs find its food.

“The Hoopes have well developed anti-predators defences in the nest. The uropygial gland of the incubating and brooding female is quickly modified to produce a foul-smelling liquid, and the glands of nestlings do so was well. These secretions are rubbed into the plumage. The secretion, which smells like rotting meat, is thought to help deter predators, as well as deter parasites and possibly act as an antibacterial agent. The secretions stop soon before the young leave the nest. In addition to this secretion nestlings are able to direct streams of faeces at nest intruders from the age of six days, and will also hiss at intruders in a snake like fashion. The young also strike with their bill or with one wing.” This point could well have been why the Hoopoe was placed on the “unclean list” of birds not to eat.

the stork, the heron after its kind, the hoopoe, and the bat. (Lev 11:19 NKJV)
the stork, the heron after its kind, and the hoopoe and the bat. (Deu 14:18 NKJV)

“The lapwing – דוכיפת duchiphath, the upupa, hoopoe, or hoop, a crested bird, with beautiful plumage, but very unclean. See Bochart, and Scheuchzer. Concerning the genuine meaning of the original, there is little agreement among interpreters.” from Adam Clarke’s Commentary on the Bible.

John Gill’s Exposition of the Whole Bible says, “and the lapwing; the upupa or hoopoe; it has its name in Hebrew, according to Jarchi, from its having a double crest; and so Pliny (o) ascribes to it a double or folded crest, and speaks of it as a filthy bird; and, according to Aristotle (p) and Aelian (q), its nest is chiefly made of human dung, that by the ill smell of it men may be kept from taking its young; and therefore may well be reckoned among impure fowl. Calmet (r) says, there is no such thing as a lapwing to be seen in any part of England; but there are such as we call so, whether the same bird with this I cannot say:”

The LORD was teaching the Israelites to obey by not eating certain animals and birds, but it appears that this was also beneficial for their health and well being.

Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ; (2 Corinthians 10:5 KJV)

See also:
Hoopoe Photos
Hoopoe Videos
Hoopoe at Wikipedia
Hoopoes Upupidae by Bird Families of the World
Wood hoopoe by Wikipedia

Eurasian Hoopoes by Ian, W. Kwong, and from an email.