# Moon-bill (*Aythya collaris*)

Canonical page: https://creaturedata.com/animals/moon-bill  
Data as of: 2026-11-11

The moon-bill (Aythya collaris) is a species in the family Anatidae, order Anseriformes. Recorded adults weigh 680 g to 730 g and live up to 20.4 years.

## Quick facts

| Fact | Value |
|---|---|
| Weight | 680 g – 730 g |
| Length | Not recorded |
| Lifespan | 20.4 years |
| Diet | Herbivore |
| Main food | Not recorded |
| Habitat | wetland |
| Egg incubation | 26.8 days |
| Young per litter or clutch | 9 |
| Age at maturity | 12 months |
| Litters or clutches a year | 1 |
| Lifestyle | Aquatic |
| Migration | Migratory |
| Conservation status | Not recorded |
| Countries on record | Not recorded |

## Classification

- kingdom: Animalia
- phylum: Chordata
- class: Aves
- order: Anseriformes
- family: Anatidae
- genus: Aythya
- species: *Aythya collaris* (Donovan, 1809)

Synonyms: *Anas collaris*, *Fuligula collaris*, *Fuligula rufitorques*, *Fulix collaris*, *Marila collaris*, *Nyroca collaris*

## Common questions

### How big is the moon-bill?

An adult moon-bill weighs 680 g – 730 g, according to values recorded on Wikidata.

### How long does the moon-bill live?

The moon-bill has a recorded lifespan of 20.4 years.

### What kind of animal is the moon-bill?

The moon-bill (Aythya collaris) belongs to the family Anatidae in the order Anseriformes.

## Sources

- [An amniote life-history database to perform comparative analyses with birds, mammals, and reptiles](https://doi.org/10.6084/m9.figshare.3563457.v1), CC0 1.0, E096-269. Myhrvold, N.P., Baldridge, E., Chan, B., Sivam, D., Freeman, D.L. & Ernest, S.K.M. (2015) An amniote life-history database to perform comparative analyses with birds, mammals, and reptiles. Ecology 96: 3109. https://doi.org/10.1890/15-0846R.1. Data: https://doi.org/10.6084/m9.figshare.3563457.v1
- [AmphiBIO, a global database for amphibian ecological traits](https://doi.org/10.6084/m9.figshare.4644424.v5), CC BY 4.0, v1. Oliveira, B.F., São-Pedro, V.A., Santos-Barrera, G., Penone, C. & Costa, G.C. (2017) AmphiBIO, a global database for amphibian ecological traits. Scientific Data 4: 170123. https://doi.org/10.1038/sdata.2017.123. Data: https://doi.org/10.6084/m9.figshare.4644424.v5
- [AVONET: morphological, ecological and geographical data for all birds](https://doi.org/10.6084/m9.figshare.16586228.v7), CC BY 4.0, v7. Tobias, J.A. et al. (2022) AVONET: morphological, ecological and geographical data for all birds. Ecology Letters 25: 581–597. https://doi.org/10.1111/ele.13898. Data: https://doi.org/10.6084/m9.figshare.16586228.v7
- [Catalogue of Life eXtended Release](https://www.checklistbank.org/dataset/316691), CC BY 4.0, 2026-10-16 XR. Catalogue of Life (2026). Catalogue of Life eXtended Release, version 2026-10-16 XR. Catalogue of Life Foundation, Amsterdam, Netherlands. https://doi.org/10.48580/dgzlf
- [Wikimedia Commons](https://commons.wikimedia.org), per file (CC0 / public domain / CC BY green, CC BY-SA amber, anything else not displayed), 2026-11-11. Wikimedia Commons contributors. Wikimedia Commons. https://commons.wikimedia.org (each file credited to its author under its own licence).
- [EltonTraits 1.0: species-level foraging attributes of the world's birds and mammals](https://doi.org/10.6084/m9.figshare.3559887.v1), CC0 1.0, 1.0. Wilman, H., Belmaker, J., Simpson, J., de la Rosa, C., Rivadeneira, M.M. & Jetz, W. (2014) EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95: 2027. https://doi.org/10.1890/13-1917.1. Data: https://doi.org/10.6084/m9.figshare.3559887.v1
- [Wikidata](https://www.wikidata.org), CC0 1.0, 2026-11-11. Wikidata contributors. Wikidata. https://www.wikidata.org (data retrieved via the Wikidata Query Service).
- [Wikipedia (English)](https://en.wikipedia.org), CC BY-SA 4.0, 2026-11-11. Wikipedia contributors. Wikipedia, The Free Encyclopedia. https://en.wikipedia.org (text under CC BY-SA 4.0; each block names its article and revision).

Cite as: Moon-bill (Aythya collaris). Retrieved from https://creaturedata.com/animals/moon-bill