Common minke whale to 20 growth layers in their tympanic bullae, which may correspond to about 15 to 20 years of age. Both sexes can live to about 50 years of age – the oldest in a study of Icelandic minke whales were 42 years for females and 47 years for males, respectively. Common minke whales have been described as ichthyophagous, but their diet also includes pelagic crustaceans and cephalopods and varies by region, season, and year. In the North Atlantic, they primarily eat small schooling fish, demersal fish, and krill. A 2007 study showed that off Spitsbergen they fed almost exclusively on
Creature type (Dungeons & Dragons) an insect, arachnid, arthropod, worm, or other invertebrate. Some have magical abilities, and others are giant versions of real insects. Most vermin are considered mindless individually. Since many vermin are too small to model individually, they are often represented as swarms (clusters that act like single creatures and sometimes have hive minds). In 4th edition, type was split into types and origins. "Beast", "humanoid" and "monstrous humanoid" remained classified as creature types, while many subtypes from earlier editions were converted to keywords, as were some types, such as "undead" and "construct". "Animates" are magically animated creatures, such as golems, zombies