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Animal Size

Hylaeamys megacephalus size: How big do they get?

How big does a Hylaeamys megacephalus get? Here is an overview over the average adult age:

A grown Hylaeamys megacephalus (Oryzomys megacephalus) reaches an average size of 12.2 cm (0′ 5″).

When born, they have an average size of 0 cm (0′ 0″). During their lifetime of about 3.75 years, they grow from 3 grams (0.01 lbs) to 57 grams (0.13 lbs). Talking about reproduction, Hylaeamys megacephaluss have 3 babies about 6 times per year. The Hylaeamys megacephalus (genus: Oryzomys) is a member of the family Cricetidae.

As a reference: Humans reach an average body size of 1.65m (5′ 5″) while carrying 62 kg (137 lbs). A human woman is pregnant for 280 days (40 weeks) and on average become 75 years old.

Hylaeamys megacephalus, also known as Azara’s broad-headed oryzomys or the large-headed rice rat, is a species of rodent in the genus Hylaeamys of family Cricetidae, of which it is the type species. It is found mainly in lowland tropical rainforest from its type locality in Paraguay north through central Brazil, French Guiana, Guyana, Suriname, and Venezuela onto Trinidad and Tobago. To its west and east, other closely related species of Hylaeamys are found: H. perenensis in western Amazonia, H. acritus in Bolivia, and H. laticeps and H. oniscus in the Atlantic Forest of eastern Brazil.It was first described by Spanish naturalist Félix de Azara. Based on his description, several names were given to the animal, including Mus megacephalus Fischer, 1814 and Mus capito Olfers, 1818, both of which were largely forgotten for over a century. When capito was rediscovered in 1960, it came in use (as Oryzomys capito) for a “species” that included about all species now placed in Euryoryzomys, Hylaeamys and Transandinomys. Later, its scope was restricted, most definitively in a detailed study in 1998 by Guy Musser and coworkers, who also reinstated the older name Mus megacephalus (as Oryzomys megacephalus). In subsequent years, the western Amazonian H. perenensis was reinstated as a species and both were moved to the new genus Hylaeamys, because they are not closely related to the type species of Oryzomys.

Animals of the same family as a Hylaeamys megacephalus

We found other animals of the Cricetidae family:

Animals with the same size as a Hylaeamys megacephalus

Not that size really matters, but it makes things comparable. So here are a couple of animals that are as big as Hylaeamys megacephalus:

Animals with the same litter size as a Hylaeamys megacephalus

Here is a list of animals that have the same number of babies per litter (3) as a Hylaeamys megacephalus:

Animals with the same life expectancy as a Hylaeamys megacephalus

Completely different animals, but becoming as old as a Hylaeamys megacephalus:

Animals with the same weight as a Hylaeamys megacephalus

As a comparison, here are some other animals that weight as much as the Oryzomys megacephalus: