12/18/2023 0 Comments Humans chimpanzee teeth anthropology![]() ![]() By Trougnouf (Benoit Brummer), CC BY 4.0, via Wikimedia Commons. By ZiemowitJ, CC BY 4.0, via Wikimedia Commons.Ĭow. Also note how flat the monkey’s nose is and how small its ears are, when compared to those of the cow. Note first how the eyes of the monkey below are more front-facing than the eyes of the cow. It provides wonderful depth perception (but a loss of peripheral vision). This type of vision means that both eyes have nearly the same field of vision with a lot of overlap between them. SensesĬompared to most other mammals, primates have an increased reliance on vision and a decreased reliance on their senses of smell and hearing.Īssociated with this are their smaller, flattened noses, loss of whiskers, and relatively small, hairless ears.Īlso associated with this are their forward facing eyes with accompanying binocular or stereoscopic vision. By Anatomography, CC BY-SA 2.1 JP, via Wikimedia Commons. By User:AngMoKio, CC BY-SA 2.5, via Wikimedia Commons. However, the human has incisors, canines, premolars, and molars - all of which perform different food processing tasks. While the crocodile’s teeth do vary in size, they don’t vary in structure. Why would this be a good thing to have?Ĭompare the teeth of the crocodile with the human teeth below. With this, they have an ability to have a more generalized diet (compared to a specialist diet), meaning that they have more dietary flexibility. Primates have heterodonty, meaning that they have different teeth that perform different tasks when processing food via biting or chewing. No other mammal has this, so it is a great diagnostic feature. The petrosal auditory bulla, a bony formation that protects the middle ear, is fused to the petrosa, which is a bony plate that is part of the temporal bone. Therefore, it functions just like another hand.Ĭheck out the similarities and differences of the various primate hands in the image above. Some monkeys, like woolly monkeys, have similar pads with fingerprints on the ends of their prehensile tails. ![]() Primates have very sensitive tactile pads on their digits with fingerprints ( dermatoglyphs). Some hypothesize that this trait allows for better grasping of objects. There are a few primates who have claw-like nails. With few exceptions, primates have flattened nails instead of claws. This means that they have either a very small or non-existent external thumb (but in that case, they will still have a small internal thumb bone). Note that a few primates, like spider monkeys, have what are called vestigial thumbs. Primates have 5 digits ( pentadactyly) on their hands and feet. This means that they have the ability to grasp and manipulate objects because of an opposable thumb and big toe. Primates have prehensile hands and most of them have prehensile feet as well. By Unknown author, Public domain, via Wikimedia Commons. Because humans share an evolutionary history with non-human primates (we share an ancestral primate), we share certain biological and behavioral traits with them. While primates share traits with other mammals, such as mammary glands and endothermy, there are a number of derived traits that all primates share.
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