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  2. Bird anatomy - Wikipedia

    en.wikipedia.org/wiki/Bird_anatomy

    Birds have acute eyesight—raptors (birds of prey) have vision eight times sharper than humans—thanks to higher densities of photoreceptors in the retina (up to 1,000,000 per square mm in Buteos, compared to 200,000 for humans), a high number of neurons in the optic nerves, a second set of eye muscles not found in other animals, and, in some ...

  3. Hearing range - Wikipedia

    en.wikipedia.org/wiki/Hearing_range

    The human auditory system is most sensitive to frequencies between 2,000 and 5,000 Hz. [10] Individual hearing range varies according to the general condition of a human's ears and nervous system. The range shrinks during life, [11] usually beginning at around the age of eight with the upper frequency limit being reduced. Women lose their ...

  4. Tympanum (anatomy) - Wikipedia

    en.wikipedia.org/wiki/Tympanum_(anatomy)

    A frog's ear drum works in very much the same way as does a human eardrum. It is a membrane that is stretched across a ring of cartilage like a snare drum that vibrates. Crossing the middle ear chamber there is an ossicle called the columella that is connected to the tympanum, and another ossicle, the operculum, that connects this to the oval ...

  5. Sound localization - Wikipedia

    en.wikipedia.org/wiki/Sound_localization

    Animals with a greater ear distance can localize lower frequencies than humans can. For animals with a smaller ear distance the lowest localizable frequency is higher than for humans. If the ears are located at the side of the head, interaural level differences appear for higher frequencies and can be evaluated for localization tasks.

  6. Owl - Wikipedia

    en.wikipedia.org/wiki/Owl

    Specifically, the foramina in their vertebrae through which the vertebral arteries pass are about ten times the diameter of the artery, instead of about the same size as the artery, as is the case in humans; the vertebral arteries enter the cervical vertebrae higher than in other birds, giving the vessels some slack, and the carotid arteries ...

  7. Cochlea - Wikipedia

    en.wikipedia.org/wiki/Cochlea

    3D model of cochlea and semicircular canals. The cochlea is the part of the inner ear involved in hearing.It is a spiral-shaped cavity in the bony labyrinth, in humans making 2.75 turns around its axis, the modiolus.

  8. Why some people have a small hole in front of their upper ears

    www.aol.com/lifestyle/2016-11-29-why-some-people...

    There is a birth defect of the ear that is visible and relatively common around the world. It is called preauricular sinus which, according to the U.S. National Institutes of Health, ...

  9. Columella (auditory system) - Wikipedia

    en.wikipedia.org/wiki/Columella_(auditory_system)

    Birds and modern crocodilians have evolved a trifurcated columella, which forms a Y-shaped support structure on the surface of the tympanic membrane. [7] In birds, this is thought to increase the surface area of the columellar footplate, thus lowering the threshold of hearing and improving the detection of airborne sound waves. [7] [3]