What is the maximal age a Risso’s dolphin reaches?
An adult Risso’s dolphin (Grampus griseus) usually gets as old as 20 years.
Risso’s dolphins are around 365 days in the womb of their mother. When born, they weight 4 grams (0.01 lbs) and measure 3.7 cm (0′ 2″). They are a member of the Delphinidae family (genus: Grampus). Fully grown, they reach a bodylength of 11 cm (0′ 5″).
As a reference: Usually, humans get as old as 100 years, with the average being around 75 years. After being carried in the belly of their mother for 280 days (40 weeks), they grow to an average size of 1.65m (5′ 5″) and weight in at 62 kg (137 lbs), which is obviously highly individual.
Risso’s dolphin (Grampus griseus) is the only species of dolphin in the genus Grampus. It is commonly known as the Monk dolphin among Taiwanese fishermen. Some of the closest related species to these dolphins include: pilot whales (Globicephala spp.), pygmy killer whales (Feresa attenuata), melon-headed whales (Peponocephala electra), and false killer whales (Pseudorca crassidens).
Animals of the same family as a Risso’s dolphin
Not really brothers and sisters, but from the same biological family (Delphinidae):
- Irrawaddy dolphin with 1 babies per pregnancy
- Northern right whale dolphin growing to a mass of 113 kgs (249.12 lbs)
- White-beaked dolphin with 1 babies per pregnancy
- Common bottlenose dolphin becoming 46 years old
- Spinner dolphin growing to a mass of 50.5 kgs (111.33 lbs)
- Atlantic humpback dolphin growing to a mass of 100 kgs (220.46 lbs)
- Peale’s dolphin growing to a mass of 120 kgs (264.55 lbs)
- Short-beaked common dolphin becoming 20 years old
- Long-finned pilot whale becoming 45 years old
- Fraser’s dolphin with 1 babies per pregnancy
Animals that reach the same age as Risso’s dolphin
With an average age of 20 years, Risso’s dolphin are in good companionship of the following animals:
- Red slender loris usually reaching 16.33 years
- Scimitar oryx usually reaching 20.42 years
- Bennett’s tree-kangaroo usually reaching 20 years
- Wolverine usually reaching 18 years
- Goat usually reaching 20.75 years
- Guatemalan black howler usually reaching 20 years
- Snow leopard usually reaching 18 years
- South American fur seal usually reaching 21 years
- Northern greater galago usually reaching 17 years
- Southern elephant seal usually reaching 23 years
Weighting as much as Risso’s dolphin
A fully grown Risso’s dolphin reaches around 387.25 kg (853.74 lbs). So do these animals:
- African manatee weighting 454 kilos (1000.9 lbs) on average
- Pygmy sperm whale weighting 431.25 kilos (950.74 lbs) on average
- Steller sea lion weighting 383.23 kilos (844.88 lbs) on average
- Plains zebra weighting 400 kilos (881.85 lbs) on average
- Leopard seal weighting 352.84 kilos (777.88 lbs) on average
- Polar bear weighting 373.35 kilos (823.09 lbs) on average
- Muskox weighting 312.67 kilos (689.32 lbs) on average
- Amazonian manatee weighting 418 kilos (921.53 lbs) on average
- Grévy’s zebra weighting 405.5 kilos (893.97 lbs) on average
- Horse weighting 401.8 kilos (885.82 lbs) on average