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.
What do blue whales eat? The blue whale is the biggest animal in the world, but strangely, it survives by eating very small creatures! These tiny animals are called krill, which look like very small shrimp and are around 1-2cm long. An adult whale can eat up to 40 million krill a day or around 8,000 lbs. Blue whales can only eat small prey because they have a very narrow oesophagus (throat). Watch a video of a blue whale below: