How many baby Goeldi’s marmosets are in a litter?
A Goeldi’s marmoset (Callimico goeldii) usually gives birth to around 1 babies.
Each of those little ones spend around 154 days as a fetus before they are released into the wild. Upon birth, they weight 50 grams (0.11 lbs) and measure 12.5 cm (0′ 5″). They are a member of the Callitrichidae family (genus: Callimico). An adult Goeldi’s marmoset grows up to a size of 28 cm (1′ 0″).
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 Goeldi’s marmoset or Goeldi’s monkey (Callimico goeldii) is a small, South American New World monkey that lives in the upper Amazon basin region of Bolivia, Brazil, Colombia, Ecuador, and Peru. It is the only species classified in the genus Callimico, and the monkeys are sometimes referred to as “callimicos”.Goeldi’s marmosets are blackish or blackish-brown in color and the hair on their head and tail sometimes has red, white, or silverly brown highlights. Their bodies are about 8–9 inches (20–23 cm) long, and their tails are about 10–12 inches (25–30 cm) long.Goeldi’s marmoset was first described in 1904, making Callimico one of the more recent monkey genera to be described. In older classification schemes it was sometimes placed in its own family Callimiconidae and sometimes, along with the marmosets and tamarins, in the subfamily Callitrichinae in the family Cebidae. More recently, Callitrichinae has been (re-)elevated to family status as Callitrichidae.Females reach sexual maturity at 8.5 months, males at 16.5 months. The gestation period lasts from 140 to 180 days. Unlike other New World monkeys, they have the capacity to give birth twice a year. The mother carries a single baby monkey per pregnancy, whereas most other species in the family Callitrichidae usually give birth to twins. For the first 2–3 weeks the mother acts as the primary caregiver until the father takes over most of the responsibilities except for nursing. The infant is weaned after about 65 days. Females outnumber males by 2 to 1. The life expectancy in captivity is about 10 years. The monkeys are able to jump as far as one end of a tennis court to another.Goeldi’s marmosets prefer to forage in dense scrubby undergrowth; perhaps because of this, they are rare, with groups living in separate patches of suitable habitat, separated by miles of unsuitable flora. In the wet season, their diet includes fruit, insects, spiders, lizards, frogs, and snakes. In the dry season, they feed on fungi, the only tropical primates known to depend on this source of food. They live in small social groups (approximately six individuals) that stay within a few feet of one another most of the time, staying in contact via high-pitched calls. They are also known to form polyspecific groups with tamarins, perhaps because Goeldi’s marmosets are not known to have the X-linked polymorphism which enables some individuals of other New World monkey species to see in full tri-chromatic vision.The species takes its name from its discoverer, the Swiss naturalist Emil August Goeldi.
Other animals of the family Callitrichidae
Goeldi’s marmoset is a member of the Callitrichidae, as are these animals:
- Black lion tamarin weighting only 656 grams
- Golden-headed lion tamarin with 2 babies per pregnancy
- Emperor tamarin becoming 20.17 years old
- Wied’s marmoset weighting only 375 grams
- White-headed marmoset weighting only 342 grams
- Buffy-headed marmoset with 2 babies per pregnancy
- Brown-mantled tamarin with 1 babies per pregnancy
- Pied tamarin with 2 babies per pregnancy
- Red-handed tamarin with 2 babies per pregnancy
- Cotton-top tamarin with 1 babies per pregnancy
Animals that share a litter size with Goeldi’s marmoset
Those animals also give birth to 1 babies at once:
- Great fruit-eating bat
- Brazilian spiny tree-rat
- Moustached tamarin
- Zempoaltepec deer mouse
- Common brushtail possum
- Long-tongued nectar bat
- Canyon bat
- Lowland paca
- Pygmy treeshrew
- Chiapan deer mouse
Animals that get as old as a Goeldi’s marmoset
Other animals that usually reach the age of 17.83 years:
- Tana River mangabey with 21 years
- Dall sheep with 16 years
- Dorcas gazelle with 17.42 years
- Dhole with 16 years
- Lesser spot-nosed monkey with 19 years
- European pine marten with 17 years
- Six-banded armadillo with 18.75 years
- White-faced saki with 20.67 years
- Townsend’s big-eared bat with 21.17 years
- Red slender loris with 16.33 years
Animals with the same weight as a Goeldi’s marmoset
What other animals weight around 558 grams (1.23 lbs)?
- Franklin’s ground squirrel weighting 458 grams
- White-footed tamarin weighting 457 grams
- Ring-tailed ground squirrel weighting 500 grams
- Arizona gray squirrel weighting 647 grams
- Peruvian tuco-tuco weighting 489 grams
- Big-headed African mole-rat weighting 622 grams
- Lesser bamboo rat weighting 472 grams
- Greater dwarf lemur weighting 447 grams
- Painted tree-rat weighting 518 grams
- Golden-rumped elephant shrew weighting 535 grams
Animals with the same size as a Goeldi’s marmoset
Also reaching around 28 cm (1′ 0″) in size do these animals:
- Desert cottontail gets as big as 32.5 cm (1′ 1″)
- Orange-brown Atlantic tree-rat gets as big as 22.7 cm (0′ 9″)
- Northern sportive lemur gets as big as 28 cm (1′ 0″)
- Eastern barred bandicoot gets as big as 32.3 cm (1′ 1″)
- Golden lion tamarin gets as big as 26.1 cm (0′ 11″)
- Hispaniolan hutia gets as big as 30 cm (1′ 0″)
- Ilin Island cloudrunner gets as big as 25.3 cm (0′ 10″)
- Arizona gray squirrel gets as big as 26.4 cm (0′ 11″)
- Hagen’s flying squirrel gets as big as 24.8 cm (0′ 10″)
- Striped possum gets as big as 25.5 cm (0′ 11″)