Final: Echolocation, Narwals, Belugas

order cetacea

suborder odontoceti, suborder mysteceti

suborder odontoceti

family monodontidae, family delphinidae

family monodontidae

narwhals, beluga

family delphinidae

dolphins, orcas, pilot whales

most cetaceans molt ___

continuously

belugas have an annual molt, which they ___

rub on rocky bottom to slough off old skin

breeching is done to ___

dislodge ectoparasites

cetaceans stay in water:

heat exhaustion, dehydration, crushed by their own weight

remoras

fish with suckers that lodge on cetaceans that increase drag and cause itch

phonic lips

flaps of tissue before nares

odontocete _____ doesn’t move but the nasal plugs and phonic lips do

larynx

odontocete echolocation clicks are made by__

vibrating phonic lips that snap together when air passes through

odontocete whistles are made by ____

nasal plugs regulating shape of vocal passageway

in odontocete, sound passes through ___, which is filled with fat and oil and amplifies, focus, modulate sound 

melon

sound waves that bounce through odontocetes go thorough the  _____ to goes to the auditory part of the brain 

lower jaw

odontocete ear bones are all gone, ears are suspended by ____

ligaments in foam filled cavity outside the skull

impedance

how easily sound waves are reflected by medium surface (air, water)

instead of air filled canals, _______ conducts sound for odontocete

fatty tissue with impedence

as target approaches interval between clicks ___

shortens

Coylacra

fossil of first echolocation whale, had sites for phonic lips and space for melon

echolocation creates __

images in the brain based on echoes from self generated acoustic signal

monodontidae eat

arctic cod, squid

monodontidae have no ___

dorsal fin

narwhals have:

spotted body, elongated left tooth, males travel in groups separate from females and calves

belugas have:

unfused cervical vertebrae, large melon, white skin, large melon

belugas’ unfused cervical vertebrae allows them: 

move head up and down, side to side maneuver in shallow water

belugas eat:

fish, squid, octopus, crabs, clams

belugas reproduction:

one calf every three years, lactate and pregnant simultaneously, give birth in warmer waters