绪论 虎鲸类型和种群(第7/8 页)
d 25，000 orcas are estimated around the Antarctic， and four types have been documented. Two dwarf species， named Orcinus nanus and Orcinus glacialis， were described during the 1980s by Soviet researchers， but most cetacean researchers are skeptical about their status， and linking these directly to the types described below is difficult.
Some examples of variations in orcas
Type A or Antarctic orcas look like a “typical“ orca， a large， black-and-white form with a medium-sized white eye patch， living in open water and feeding mostly on minke whales.
Type B1 or pack ice orcas are smaller than type A. It has a large white eye patch. Most of the dark parts of its body are medium grey instead of black， although it has a dark grey patch called a “dorsal cape“ stretching back from its forehead to just behind its dorsal fin. The white areas are stained slightly yellow. It feeds mostly on seals. Type B1 orca are abundant between Adelaide Isl
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