"Killer whale" or the plural is a common noun. It is only capitalised where a common noun would normally be (i.e. the start of a sentence or if it is used as a proper noun).
Killer whales live in polar regions, where they eat cute little penguins.
yes, I can.
what colors are Killer Whales what colors are Killer Whales what colors are Killer Whales
There are about 3000 killer whales in the world.
killer whales do eat puffins killer whales do eat puffins
killer whales growth
no Killer whales are endothermic
yes killer whales do eat pilot whales
Usually killer whales kill blue whales.
Yes, killer whales are also referred to as the orca whales or orcas.
That would be a pod of killer whales.
Killer whales stay in the ocean.
no, but the number of killer whales has decreased
A killer whale has no predators.