Blue whales have long and streamlined bodies with the head making up a fourth of its body length. The head region is broad and U-shaped. Blue whales do not have teeth. Instead, they have 270 - 395 plates of baleen on either side of their jaw.Baleen look like long thin teeth placed very close to one another.he head region is broad and U-shaped. Blue whales do not have teeth. Instead, they have 270 - 395 plates of baleen on either side of their jaw. Baleen look like long thin teeth placed very close to one another.
Hives frequently occur following an infection or as a result of an allergic reaction such as to medication, insect bites, or food. Psychological stress, cold temperature, or vibration may also be a trigger. In half of cases the cause remains unknown. Risk factors include having conditions such as hay fever or asthma.
Causes. 1  Widespread hives usually are caused by a viral infection. 2  Can also be an allergic reaction to a food, drug, infection, insect bite, or other substances. 3  Often, the cause is not found. 4  Hives from foods usually resolve in 6 hours.