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The phrase "a orca" is correct and usable in written English.
It can be used when referring to a single orca, which is a type of marine mammal also known as a killer whale.
Example: "During our trip to the aquarium, we were excited to see a orca performing tricks in the water."
Alternatives: "one orca" or "an orca whale".
Exact(3)
The slides were mounted in N-propyl gallate and serial image stacks (0.2-µm Z-increment) were collected at 100x (oil immersion 1.4 NA) on a motorized Olympus BX microscope equipped with a differential interference contrast optics, and a Orca R2 (Hamamatsu, Japan).
Images were acquired with a Plan Apo lambda 60×/1.4 NA objective and a Orca R2 CCD camera (Hamamatsu).
Images were recorded with a ORCA II CCD camera (Hamamatsu Photonics), using Image-Pro Plusoftwarere (Media Cybernetics), or with a CoolSNAP CCD camera (Roper Scientific, Photometrics), using softWoRx 3.5 software (Applied Precision).
Similar(57)
"That would be true for an orca, a tiger and a chimpanzee," said Steven Feldman, a spokesman.
In 1964, the Vancouver Aquarium commissioned a sculptor to kill an orca to use as a model for an artificial one.
True to the seaside theme, you can ride an orca whale, a seal and a chariot braced by two lobsters.
"Blackfish," a documentary by Gabriela Cowperthwaite, looks at the 2010 killing of a trainer by an orca at Shamu Stadium in Orlando.
But until now there was no scientific record of an orca killing a humpback whale.
When an orca encounters a stingray they dig them up from the sand, then launch them into the air.
Second, we followed an orca for about an hour in a little boat.
Nor can a matador, a spear fisherman or even an Orca trainer.
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