Looks Like An Oreo To Me
I will make this a brief post because the subject matter is boring/bordering on the freakish. Phragmosis refers to physical and behavioural adaptation noted in multiple genera. The body of the animal concerned exhibits morphological characteristics that aid in the defense of its burrow. An excellent example is to be observed in the humble ant. Cephalotes varians, colloquially known as the 'Turtle Ant' is a fine representation as shown in the above illustration. In this instance, the head is modified to resemble a shield. And indeed, the ant utilises the cephalic structure to block the entrance to its nest. In this way, predatory ant species and parasitic wasps are denied entry into the abode. In addition, the ant can use its outstretched head structure to glide from trees in parachute fashion, guiding its descent to elegantly alight at the nest's entrance. Characteristically, this adaptation in its most extreme form is confined to soldier ants, although the worker caste does exhibit a small degree of head modification. On their way out of the nest, worker ants stroke the soldier with their antennae. Once alerted, the soldier will stand to attention, allowing egress. Once the worker returns, it uses antennae to gently tap the 'door'. Is there a code that must be followed regarding the velocity and sequence of the drum play? This could constitute a weakness in the blocking system. Evolutionary pressure would quickly modify a predatory wasp's behaviour to mimic the worker ant to crack the code. No doubt, behavioural adaptation would be easier to evolve than a physical appendage with the ability to remove the head. It is easy to conceive mutual coadaptation between predator and prey as a continuous battle as each species responds to the prevailing evolutionary pressure.
Further examples of this remarkable bodily adjustment can be found in vertebrates, such as frogs and snakes. However, very few examples are found in mammalian species. The only example I can find relates to a small armadillo resident of western Argentina. This six-inch-long creature sports a bony carapace to the rear that blocks the burrow while digging. A burrowing snake species indigenous to the Indian subcontinent has developed a bony shield at the tail. Again, like the armadillo, this shield blocks the snake's tunnel during excavation.
In the unenlightened past, theologians used physical adaptations to denote god's glory and providence. In the 18th century, Rev. William Paley put forth this idea eloquently in his analogy of the watch. Imagine you are strolling upon a sandy beach, and your eyes should suddenly alight on a watch, deftly awash with spume and sand. You examine the watch and marvel at the delicate intricacies of the components and engineering. The good Reverand argued that it is reasonable to postulate that the watch had a maker. And therefore, the complexity observed in natural organisms is sufficient reason to conclude that they are the product of a divine architect. But not just any craftsmen, but the Ultimate Craftsman, Yahweh, the jealous deity of a Bronze Age barbarous folk. And yes, before Darwin, thoughtful individuals could be excused for thinking that a divine artificer was responsible. The manifest complexity of nature would pose a serious barrier to atheistic thought before the conception of natural selection, whereby small accumulative, adaptive changes could occur due to environmental pressures applied over aeons.
Post-Darwin, the hand of God is no longer required to explain the manifest complexity of life. In fact, the 'Hand of God' was never a satisfactory explanation for nature's evident complexity. The explanation ultimately relies on the irrational concept of Divine Intervention or an invisible deity by unknowable means doing stuff. This does not inspire those taking a rational stance. Before we posit the action of supernatural causation (whatever that means), tis best to exhaust all that is natural and grounded within this world. If we look hard enough, a natural explanation will come. To post an explanation outside nature is easy to articulate and just as easy to dismiss.