marsupial
Let an agent explain marsupials and their reproduction, relay diversity, evolution and conservation from zoological sources, describe major groups, and distinguish marsupials from placental mammals and monotremes and the young joey from the adult.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain marsupials and their reproduction, relay diversity, evolution and conservation from zoological sources, describe major groups, and distinguish marsupials from placental mammals and monotremes and the young joey from the adult.
A mammal of the infraclass Marsupialia whose young are born at an early stage and complete development attached to a teat, often in a pouch, including kangaroos and their young called joeys, rat-kangaroos, koalas, wombats, possums, the small carnivorous marsupial mice or dunnarts, and the American opossums; marsupials number about 330 species, mostly in Australasia and the Americas, and diverged from placental mammals over 100 million years ago.
What it is for: Not applicable; a mammal group.
It can be explain reproduction and groups; relay evolution and conservation; describe examples; distinguish related mammals.
Distinguishing features
Pouch and teat development
Australasian and American
Diverse forms
Ancient lineage
What it looks like
Mammals ranging from kangaroos to mouse-sized dunnarts, many with pouches.
Physical character
species: about 330 count
divergence from placentals: over 100 million years ago
largest: red kangaroo, up to 90 kg note
smallest: long-tailed planigale, about 4 g note
How it is recognised
Mammal with early-born young developing on a teat
Kangaroos and joeys, rat-kangaroos, marsupial mice, koalas, wombats, opossums
Placentals gestate longer; monotremes lay eggs; a joey is any marsupial young
Related models
is a kind of - in registry terms
belongs to - the infraclass
is contrasted with - with longer gestation
is exemplified by - the best known marsupial
In practice
Families and kinds
kangaroos, wallabies and rat-kangaroos
koalas and wombats
possums and gliders
dasyurids including marsupial mice, quolls and the Tasmanian devil
bandicoots and bilbies
American opossums and shrew opossums
Identifiers
infraclass Marsupialia
Standards and regulation
Australian wildlife protection laws
IUCN Red List assessments
CITES listings for some species
Failure modes and hazards
Extinctions and declines from predators and habitat loss
Confusing joey with a species
Registry aliases mixing a young stage and groups
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.marsupial
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What marsupials are.
Science.
Definition
Definition and reproduction.
Definition
Definition.
- What are marsupials, how does their reproduction work, and how do they differ from placentals and monotremes? definition
- Is the question about the group, a family, a species or conservation? boundary
Groups
Groups.
Groups
Groups.
- What are the major groups, from kangaroos and rat-kangaroos to marsupial mice and opossums, and what is a joey? definition
- Which entry fits the specific group? action
Biology Biology and evolution.
Science.
Evolution
Evolution.
Evolution
Evolution.
- How did marsupials evolve and spread between the Americas and Australia via Antarctica? provenance
- Which references are standard? provenance
Adaptations
Adaptations.
Adaptations
Adaptations.
- What adaptations do marsupials show, from hopping to embryonic diapause? provenance
- Which sources are cited? provenance
Conservation Conservation.
Application.
Threats
Threats.
Threats
Threats.
- Why have so many marsupials declined, and which are threatened? provenance
- Which entry fits Australian mammal extinctions? action
Protection
Protection.
Protection
Protection.
- How are marsupials protected and recovered? provenance
- Which entry fits wildlife conservation in Australia? action
Context Culture and study.
Context.
Culture
Culture.
Culture
Culture.
- How do marsupials figure in Aboriginal cultures and national symbols? provenance
- Which entry fits kangaroo in culture? action
Study
Study.
Study
Study.
- How are marsupials studied, including as models in developmental biology? provenance
- Which entry fits mammalogy? action
What the second pass must settle
- Should kangaroo, dasyurid and opossum be separate primary entries?
- How should zoological sources be linked?
- The registry entry has merged aliases naming a young stage and two groups; should they be split off?