Sei Whale 

(Balaenoptera borealis)

Average size: 14 meters (47 feet) and 20 tonnes (44,000 pounds)

Appearance: Sei whales have a dark gray to black body, white colored belly, and irregular light gray to white markings. They are the third largest whale species after blue and fin whales

Worldwide conservation status Endangered

U.S. conservation status: Endangered 

New York conservation status: Species of Greatest Conservation Need

Vocalizations: They produce loud, low-frequency sounds that go down in pitch and are generally produced in doublets (pairs) or triplets. Calls last between 1–2 seconds