1 Pain: Persistent mouth pain is another common oral cancer sign. 2  A lump or thickening in the cheek. 3  A white or red patch on the gums, tongue, tonsil, or lining of the mouth. 4  A sore throat or feeling that something is caught in the throat that does not go away.
Blue whales are the largest predator to ever inhabit this planet, though it is thought to feed almost exclusively on tiny, shrimp-like creatures called euphausiids or krill. Feeding is usually at depths less than 100 m; harpooned animals have dived as deep as 500 m.lue whales, Balaenoptera musculus (Linnaeus, 1758), like all rorquals (Family Balaenopteridae, the family that includes the blue whale, Bryde's whale, fin whale, humpback whale, minke whale, and sei whale), are long, slender whales that are much more streamlined than other large whales.
For the most part blue whales are too large to have any known natural predators. In fact the only known predators to attempt to attack a blue whale is a group of killer whale.While these instances are rare there have been people who have confirmed witnessing such attacks and even a few videos have been recorded showing a group of killer whales attacking a blue whale.n these attacks a large pod of killer whales are usually spotted working cooperatively in an attempt to try to successfully take down a blue whale by surrounding it from the front, sides and bottom to hopefully prevent it from escaping.