How many hearts does an octopus have?
An octopus has three hearts: two pump blood through the gills and one pumps it to the rest of the body.
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- How do scientists identify individual manta rays?
“Each manta ray has a unique pattern of spots on its belly.”
Reference: Manta Trust
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Which fish has the largest brain for its body size?
Manta rays have one of the largest brain-to-body ratios of any fish.
How do scientists identify manatees?
Scientists identify individual manatees by scars from boat propellers.