Mammal
Sei whale
Balaenoptera borealis · Balaenopteridae · Cetacea
Best monthsMay–Julmost records
Records12,949in 16 countries
Most seen inPortugal3,326 records
Red ListEndangeredIUCN status
Photo: Christin Khan, NOAA / NEFSC · Public domain · Wikimedia CommonsReport this photo · linked, not stored
About
Sei whale in brief
The sei whale (Balaenoptera borealis) is a mammal of the Balaenopteridae family — species of mammal.
Across the 16 countries we cover it has 12,949 published records, most of them from Portugal, Iceland and Norway. It is strongly seasonal: records peak in May, June and July and fall to their lowest in November and December.
Its global conservation status is endangered on the IUCN Red List.
Records by month
All countries combined · the strongest months highlightedJFMAMJJASOND
Where & when
When to look in each country
Portugal3,326 records · best Jun, May
Iceland2,752 records · best Aug, Jul
Norway2,386 records · best Jun, Jul
Canada1,924 records · best Sep, Jul
United Kingdom1,624 records · best Jun, Jul
Argentina401 records · best Mar, Jan
Chile363 records · best Feb, Jan
Denmark39 records · best Dec, Nov
Uruguay37 records · best Jan, Feb
Morocco30 records · best Jan, Feb
Mauritania27 records · best May, Jan
New Zealand20 records · best Jan, Dec
Ireland9 records · best Aug, Nov
Micronesia8 records · best Jan, Mar
Dominican Republic2 records · best Jul, Jan
Dominica1 records · best Jan, Feb
Map
Where it has been recorded
Density of published records; brighter cells have more records.
Relatives
All mammals
