Though smaller than many other phocids, harbor seals are similar in size to most otariids.
虽然港海豹的体型较小，但其体型与大多数的 otariids（海狮和海狗）相似。
2
Harbor seals are small compared with other phocids species such as grey seals, all of which are known to fast for the entire lactation period.
与其他 phocids 物种（如灰海豹）相比，港海豹体型较小。众所周知，灰海豹在整个哺乳期都禁食。
3
There is already some evidence suggesting that the ringed seal, a phocids species that is similar in size to the harbor seal, may also use a maternal foraging strategy.