They watched for moments where the playing bears were looking into each other's faces, and then they looked for certain facial expressions, like opening one's mouth wide and showing teeth.
|
|
Close up of a male convict cichlid showing teeth In natural habitats, the species has a diet composed of various prey, including crustaceans, small fish, insects, worms, plants and algae. The fish can protrude its jaw 4.2% of its standard length, allowing it to have a varied diet. Inferior social status and associated stress can affect digestive function in convict cichlids.Earley, R. L., L. S. Blumer, and M. S. Grober. (2004).
|
|
Scathascolex is a genus of palaeoscolecid worm known from the middle Cambrian Burgess Shale. It is the only taxon in that famous locality to exhibit the phosphatic plates that characterize palaeoscolecids, and has certain unusual characteristics – it does not have the multiple sizes of tessellating plates more typical of palaeoscolecids, and has more tail hooks than is the norm. Nevertheless, it is clearly a close relative of Palaeoscolex and Wronascolex. Pharyngeal region of Scathascolex minor, showing teeth and spines.
|
|
American alligator showing teeth The snout of an American alligator The teeth number 74–80. As American alligators grow and develop, the morphology of their teeth and jaws change significantly. Juveniles have small, needle-like teeth that become much more robust and narrow snouts that become more broad as the individuals develop. These morphological changes correspond to shifts in the alligators' diets, from smaller prey items such as fish and insects to larger prey items such as turtles, birds, and other large vertebrates.
|
|
The scales may be modified into spines for display or protection, and some species have bone osteoderms underneath the scales. Red tegu (Tupinambis rufescens) skull, showing teeth of differing types The dentitions of lizards reflect their wide range of diets, including carnivorous, insectivorous, omnivorous, herbivorous, nectivorous, and molluscivorous. Species typically have uniform teeth suited to their diet, but several species have variable teeth, such as cutting teeth in the front of the jaws and crushing teeth in the rear. Most species are pleurodont, though agamids and chameleons are acrodont.
|
|
The fresco is composed as a large miniature, where in a luxurious garden surrounded by a hedge, Death enters riding a skeletal horse, firing arrows from a bow. Death aims at characters belonging to all social levels, killing them. The horse occupies the centre of the scene, with its ribs visible and an emaciated head showing teeth and the tongue. Death has just released an arrow, which has hit a young man in the lower right corner; Death also wears a scythe at the side of the saddle, its typical attribute.
|
|
Mouth of a Port Jackson shark showing teeth and crushing plate Two Port Jackson sharks, demonstrating "harness" feature Port Jackson sharks can grow up to long and are similar to others of their genus, bearing a broad, blunt, flat head, an anal fin, and crests above its eyes. However, the species possesses characteristics that make them easily identifiable, such as their teeth and the harness-like markings which run for a majority of their body length. These markings run from their eyes to their first dorsal fin and then across the rest of their bodies. Both dorsal fins are close to equal size, each with a spine at the foremost edge.
|
|
Lateral aspect of chelicera, showing teeth and cutting edge Among the most distinctive features of the Solifugae are their large chelicerae, which in many species are longer than the prosoma. Each of the two chelicerae has two articles (segments, parts connected by a joint), forming a powerful pincer, much like that of a crab; each article bears a variable number of teeth, largely depending on the species. The chelicerae of many species are surprisingly strong; they are capable of shearing hair or feathers from vertebrate prey or carrion, and of cutting through skin and thin bones such as those of small birds. Many Solifugae stridulate with their chelicerae, producing a rattling noise.
|
|
Voluntary facial movements, such as wrinkling the brow, showing teeth, frowning, closing the eyes tightly (inability to do so is called lagophthalmos),Kliniska Färdigheter: Informationsutbytet Mellan Patient Och Läkare, LINDGREN, STEFAN, pursing the lips and puffing out the cheeks, all test the facial nerve. There should be no noticeable asymmetry. In an upper motor neuron lesion, called central seven, only the lower part of the face on the contralateral side will be affected, due to the bilateral control to the upper facial muscles (frontalis and orbicularis oculi). Lower motor neuron lesions can result in a CN VII palsy (Bell's palsy is the idiopathic form of facial nerve palsy), manifested as both upper and lower facial weakness on the same side of the lesion.
|
|
Plate XIII from Cretaceous Reptiles of the United States, showing teeth of Astrodon on the bottom left Two dinosaur teeth were received in late November 1858 by chemist Philip Thomas Tyson from John D. Latchford. They had been found in Latchford's open iron ore pit in the Arundel Formation at Swampoodle near Muirkirk in Prince George's County, Maryland. Tyson let them be studied by the dentist Christopher Johnston, professor at the Baltimore Dental College, who cut one tooth in half and thereby discovered a characteristic star-formed cross-section. Johnston named Astrodon in 1859. However, he did not attach a specific epithet, so Joseph Leidy is credited with naming Astrodon johnstoni (the type species) in 1865, with as holotype specimen YPM 798.
|
|