. Cetaceans of the Channel Islands National Marine Sanctuary / prepared for National Oceanic and Atmospheric Administration, Channel Islands National Marine Sanctuary and NOAA, National Marine Fisheries Service by Stephen Leatherwood, Brent S. Stewart, Pieter A. Folkens. Whales California Channel [1] Ventral grooves are longitudinal folds located on the chin, throat and abdomen of rorqual whales. Do not confuse them with the 2-3 deep longitudinal creases found on the throat of gray whales (item ) or the "V" shaped creases on the throat of dwarf sperm whales (item )
. Cetaceans of the Channel Islands National Marine Sanctuary / prepared for National Oceanic and Atmospheric Administration, Channel Islands National Marine Sanctuary and NOAA, National Marine Fisheries Service by Stephen Leatherwood, Brent S. Stewart, Pieter A. Folkens. Whales California Channel [1] Ventral grooves are longitudinal folds located on the chin, throat and abdomen of rorqual whales. Do not confuse them with the 2-3 deep longitudinal creases found on the throat of gray whales (item ) or the "V" shaped creases on the throat of dwarf sperm whales (item ) and beaked whales (items , 14, and 15). Such creases, though variable in depth, orientation, and length, always end on the throat, well short of the naval. [2] Counts of ventral grooves are made between the flippers and do not include shorter grooves often found on the side of the head and on the side above the flipper. [3] Minke whales in some areas have been reported to have as many as 300-325 plates per side. [4] Blue and fin whales have faint lateral ridges, as well. 55. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Leatherwood, Stephen; Stewart, Brent Scott; Folkens, Pieter A; Channel Islands National Marine Sanctuary (Agency : U. S. ); United States. National Marine Fisheries Service. Santa Barbara, Calif. : The Sanctuary
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