type b2 or gerlache orcas are morphologically similar to type b1， but smaller this ecotype has been recorded feeding on penguins and seals， and is often found in the gerlache strait
type c or ross sea orcas are the smallest ecotype and live in larger groups than the others its eye patch is distinctively slanted forwards， rather than parallel to the body axis like type b， it is primarily white and medium grey， with a dark grey dorsal cape and yellow-tinged patches its only observed prey is the antarctic cod
type d or sub-antarctic orcas were first identified based on photographs of a 1955 mass stranding in new zealand and si