48 The Essex Naturalist two calves. Some men slit the body open and delivered the young ones, one living about 20 minutes and the other only a very short time. During the night one was stolen, but one remained on exhibition with its mother. It measured 17ft. 9in. (5.41m) with a girth of 7feet. (2.13m)." (Anon, 1899). Date Location Sex Length Ref 1849 Grays ? 17.68m Laver 12/2/1891 Holliwell Point F 14.17m Laver 27/11/1899 Barking Creek F 20.29m Anon 30/9/1962 Brightlingsea ? 12.50m FCF 28/10/1995 Foulness ? 20.42m Southend Museum Sei whale (Balaenoptera borealis) Lesson The sei whale has stranded on three occasions, but only once during the last century. Two further individuals that were present in the Thames stranded at Hope Reach: the first near Gravesend in 1859 and the second in the Medway on 30th August 1888. Date Location Sex Length Ref 1/11/1883 Creeksea M 8.83m Laver 19/10/1887 Tilbury M 10.77m Laver 12/9/1948 Little Holland ? 4.88m FCF Minke whale (Balaenoptera acutorostrata) Lacepede This, the smallest rorqual, has been stranded on two occasions. Date Location Sex Length Ref 2/9/1900 Steeple F 5.08m Fitch 28/10/1996 Purfleet ? 4.65m Southend Museum Narwhal (Monodon monoceros) L. This exceptional record was only the fifth for the United Kingdom. Date Location Sex Length Ref 17/2/1949 Rainham ? 3.94m FCF Northern bottlenose whale (Hyperoodon ampullatus) Forster The largest of the British beaked whales, the northern bottlenose whale occurs mainly in deeper waters off the west coast of Britain and Ireland: however, the species may be declining as there have been fewer strandings in recent years. A school of whales was apparently present in Essex offshore waters in the summer of 1939 and an unidentified odontocete, stranded at East Mersea on 7th August of that year and measuring 5.49m, may have been of the same species. Another