The large crooked talons of birds of prey, and their hooked beaks, are well formed for securing and tearing their victims. The formation of the feet of the woodpeckers, the toes being placed two forward and two backward, is well calculated for climbing, and the cuneiform shape of the extremity of their bills is suited to the purpose of cutting holes in decayed trees; their tongue is also wonderfully contrived to search out insects beyond the reach of their bill, by its great length, which is double that of the tongue at least. The wryneck has this singularity, as well as the like formation of toes; which last is also found in the cuckoo: but neither of these birds is seen to climb up the bodies of trees, nor have either the stiff sharp-pointed feathers in the tail, as in the woodpecker, so admirably adapted to support them when in the act of hewing. This agrees with the observations of an ingenious living naturalist, the Rev. Revett Shepherd. “The cuckoo,” says he, “is furnished with two toes before and two behind, and yet is never known actually to climb, a convincing proof that such conformation does not necessarily bring with it the power of climbing, more especially when we consider that the nuthatch (Sitta Europæa), and the creeper (Certhia familiaris), have their toes placed in the usual manner, and yet run up and down trees with as much facility as the woodpeckers. The use of the pedes scansorii, as they evidently in this case conduce not to climbing, I judge to be this; it is well known that this bird will oftentimes sit by the half-hour together on the bough of a tree, vociferating its loud and pleasing note; in doing this, it sits remarkably forward, and appears in constant agitation, continually moving its body up and down with great elegance; now, as it sits so forward, while using this exertion, it would be liable to lose its balance and quit its hold, had it only one toe behind; whereas, by the contrivance of two, it is enabled strongly to adhere to the branch.”
The legs and feet of aquatic birds are wonderfully formed for accelerating their motion in that element, which is their greatest security. The bone of the leg is sharp, and vastly compressed sideways: the toes, when the foot is brought forward, close in behind each other in such a manner as to expose a very small surface in front, so that, in the action of swimming, very little velocity is lost in bringing the legs forward; this is very conspicuous in the diver. Some aquatic birds are web-footed before the whole length of the toes, as in the ducks; others only half the length of the toes, like the avoset. Some again have all four toes webbed, as in the cormorant; others whose feet are furnished with a fin-like membrane or each side of the toes; these are either plain, as in the grebe, or lobed, as in the coot and phalarope. There are also some who swim and dive well, whose toes are long and slender, and not furnished with webs or fins, such as the water-hen and rail; but these live as much on land as in water. The gulls and terns, although web-footed, seem incapable of diving; the latter, indeed, we never observed to settle on the water; the former is so buoyant that it floats elegantly on the surface. The avoset, whose feet bespeak it an inhabitant of the water, does not seem to have the power of swimming; the water-ouzel, on the other hand, has not the least appearance of an aquatic, nor can it swim; but it will dive, and remain a long time under water. The serrated claw in the heron and nightjar is a singular structure, which we have not discovered the use of. The bill as well as the feet of birds, makes one of the strong natural divisions; but these are described under the head of each genus.
Of Horses.—Contraction is the most general evil among the feet of our horses, and some breeds appear more liable to it than others: it is peculiarly the case with blood-horses. Colour also seems to have some influence in contracting the feet; hence I have observed dark chestnuts particularly prone to it. A good foot should exhibit a proper line of obliquity: when the horn is very upright, however wide and open the heels, such feet soon become defective. This is but seldom attended to, even among those who esteem themselves judges; but no rule admits of fewer exceptions, than that such a foot soon becomes faulty. There should also be a proper height of horn: when there is too much, it disposes to contraction: when too little, the heels, quarters, and soles must, of necessity, be weak, and tenderness in going must be the consequence.
The heels should be particularly attended to; they must be wide, and the frog healthy, firm, yet pliable and elastic. Contraction of their cleft is their most common defect, and is frequently accompanied with a general lessening of the circumference of the foot. Such a foot will probably feel hotter than natural; the frog also will be compressed and small, and very likely thrushy.
When a horse’s foot is held up, the sole should present a concave surface: if it be less concave than natural, that sole is weak, and will not bear much pressure; and it is more than probable it will continue lessening in concavity until it becomes a plane, when every subsequent shoeing will endanger the laming of the animal. White feet are very objectionable on this account, for they are particularly liable to become flat in the sole: their quarters, also, are commonly weak, and fall in; and when neither of these evils take place, they yet have seldom strength enough to resist contraction: and it may be determined on, that, when there are three dark and one white foot, in nineteen instances out of twenty, the white foot becomes defective sooner than the dark ones.
Another very serious complaint is a brittleness of hoof, which may be generally be detected by the marks of the fragile parts detaching themselves from every old nail-hole. This kind of foot, particularly in hot weather, breaks away, till there is no room for the nails to hold, when the horse, of course, becomes useless. In an examination of the foot, the eye should also be directed to the wearing of the shoe: if it be unequally worn, particularly if the toe be worn down, such a horse is probably a stumbler, and does not set his foot evenly on the ground, either from defective feet or natural gait.
The feet of horses being the very basis of support, upon which the safety and expedition of the frame entirely depends, they are entitled to every possible degree of care and attention; more particularly in the winter season, when, from neglect, so many ills and inconveniences are known to arise. The injuries, accidents, and diseases, to which the feet are constantly liable, consist of cracks in the heels, scratches or lacerations, stubs and bruises of the outer sole, or upon the verge of the coronet between hair and hoof, corns, sandcracks, thrushes, canker, quitter, ringbone, and footfounder; exclusive of the frequent injuries sustained in shoeing, by the ignorance, indolence, or obstinacy of those smiths who, having no professional reputation to support, are too innately confident in their own ability to bear instruction.