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