How many baby Northern fur seals are in a litter?
A Northern fur seal (Callorhinus ursinus) usually gives birth to around 1 babies.
Each of those little ones spend around 304 days as a fetus before they are released into the wild. Upon birth, they weight 5.35 kg (11.8 lbs) and measure 12.5 cm (0′ 5″). They are a member of the Otariidae family (genus: Callorhinus). An adult Northern fur seal grows up to a size of 1.74 meter (5′ 9″).
To have a reference: Humans obviously usually have a litter size of one ;). Their babies are in the womb of their mother for 280 days (40 weeks) and reach an average size of 1.65m (5′ 5″). They weight in at 62 kg (137 lbs), which is obviously highly individual, and reach an average age of 75 years.
The northern fur seal (Callorhinus ursinus) is an eared seal found along the north Pacific Ocean, the Bering Sea, and the Sea of Okhotsk. It is the largest member of the fur seal subfamily (Arctocephalinae) and the only living species in the genus Callorhinus. A single fossil species, Callorhinus gilmorei, is known from the Pliocene of Japan and western North America.
Other animals of the family Otariidae
Northern fur seal is a member of the Otariidae, as are these animals:
- Arctocephalus forsteri with 1 babies per pregnancy
- Steller sea lion with 1 babies per pregnancy
- Galápagos fur seal with 1 babies per pregnancy
- South American sea lion with 1 babies per pregnancy
- Subantarctic fur seal with 1 babies per pregnancy
- South American sea lion with 1 babies per pregnancy
- New Zealand sea lion with 1 babies per pregnancy
- Brown fur seal with 1 babies per pregnancy
- Antarctic fur seal with 1 babies per pregnancy
- California sea lion with 1 babies per pregnancy
Animals that share a litter size with Northern fur seal
Those animals also give birth to 1 babies at once:
- Lesser kudu
- Oecomys concolor
- Mongoose lemur
- Admiralty flying fox
- Hottentot golden mole
- Northern glider
- Goodfellow’s tree-kangaroo
- Blackbuck
- Gray snub-nosed monkey
- Ozimops planiceps
Animals that get as old as a Northern fur seal
Other animals that usually reach the age of 35 years:
- Lar gibbon with 40 years
- Beluga whale with 40 years
- Sloth bear with 40 years
- Guinea baboon with 40 years
- West Indian manatee with 30 years
- Spotted seal with 35.5 years
- Siamang with 38 years
- Lion-tailed macaque with 40 years
- Rodrigues flying fox with 30 years
- Crab-eating macaque with 38 years
Animals with the same weight as a Northern fur seal
What other animals weight around 55.58 kg (122.54 lbs)?
- West Caucasian tur usually reaching 60.73 kgs (133.89 lbs)
- Pronghorn usually reaching 47.18 kgs (104.01 lbs)
- Javan rusa usually reaching 65.8 kgs (145.06 lbs)
- Cougar usually reaching 53.93 kgs (118.9 lbs)
- Caspian seal usually reaching 62.3 kgs (137.35 lbs)
- Sun bear usually reaching 57.04 kgs (125.75 lbs)
- Iberian ibex usually reaching 60.55 kgs (133.49 lbs)
- Sika deer usually reaching 53 kgs (116.84 lbs)
- Queen of Sheba’s gazelle usually reaching 48.5 kgs (106.92 lbs)
- Fallow deer usually reaching 56.71 kgs (125.02 lbs)
Animals with the same size as a Northern fur seal
Also reaching around 1.74 meter (5′ 9″) in size do these animals:
- Subantarctic fur seal gets as big as 1.63 meter (5′ 4″)
- Javan rusa gets as big as 1.63 meter (5′ 5″)
- Southern reedbuck gets as big as 1.51 meter (5′ 0″)
- Dama gazelle gets as big as 1.46 meter (4′ 10″)
- Hirola gets as big as 1.6 meter (5′ 3″)
- Juan Fernández fur seal gets as big as 1.7 meter (5′ 7″)
- Cheetah gets as big as 1.48 meter (4′ 11″)
- Naemorhedus sumatraensis gets as big as 1.45 meter (4′ 10″)
- New Zealand sea lion gets as big as 2.02 meter (6′ 8″)
- Cougar gets as big as 1.4 meter (4′ 8″)