Small reddish nematodes up to 10 mm. long. Microscopically, the head looks swollen because of the dilated anterior end.

These lice are small (1 to 2 mm. long) flattened, wingless insects. Biting lice have broad heads with mouth parts adapted for chewing. There are brown transverse markings on the abdomen.

Adults are up to 8 cm. long, thin, and milky white. Females are longer than males.

Adult liver flukes are about 20-30 mm long and 7-14 mm wide. They are leaf-shaped, broader anteriorly than posteriorly, with an anterior cone-shaped projection that bears the anterior ventral sucker and mouth.

Adults are about half the size of house flies. They have piercing, sucking mouthparts, and both sexes feed on blood and tissue fluids.

Wingless, flattened insect, 3.4 to 4.8 mm. long and fairly broad with mouth parts adapted for sucking. The nose referred to in the name is actually a short head. The legs have claws at the end which are used for hanging onto hair.

Adults are 10 to 30 mm. long. Males are shorter than females and have an even, reddish color and a bursa with an asymmetrical dorsal lobe and barbed spicules. Females are identified as "barber's pole worms" because their white ovaries are wound around their red blood-filled intestine.

Adults are hairy flies without functioning mouth parts. Thus they do not feed. The abdomen has three bands of hairs, light yellow hairs toward the front, dark hairs in the middle and orange-yellow hairs at the rear. The name "bomb flies" comes from the adults' habit of darting at the cattle. H. bovis is 15 mm. long, H.lineatum is 13 mm. The larvae or grubs are large with a segmented surface tapering at both ends.

Wingless insect, 2.5 mm. in length, with a long narrow head and slender body. The mouth parts are adapted for sucking. These lice are blue in color due to blood seen through the yellowish-brown body wall.

Adult worms are stout bodied and 14 to 22 mm. long.

Adults are brownish and thread-like. growing to 9 mm. in length.

All legs project beyond the margin of the oval body. The first two pairs of legs are stout while the last two pairs are thin. Wavy lines cross the surface of the mite’s body. Pretarsi are present with long jointed pedicules.

Itch mites are small, about 330 to 600 microns by 250 to 400 microns, and roughly circular in shape. All legs are short; the third and fourth pairs do not project beyond the body margin. The upper surface has many small triangular scales. Females have a number of spines on this surface. Pretarsi are present.

Adults are small (1-5 mm), wingless, insects that are obligate parasites (depend on their host for survival). They are generally found only on cattle. Sucking lice have heads narrower than the thorax and have mouthparts adapted to piercing the skin to feed on blood and tissue fluids.

Adults are short and thin, 3.5 to 6 mm. long and only 0.05 to 0.06 mm. wide.

The adult worm is tiny (0.5 centimeters) and hair-like.

Long roundworms; the front or anterior part is long and thin while the posterior is much thicker, giving the appearance of a whip. Posterior of male is curled.