---
title: "Oldfield Mouse"
description: "Peromyscus polionotus — Mammals. The oldfield mouse, oldfield deermouse or beach mouse (Peromyscus polionotus) is a nocturnal species of rodent in the family Cricetidae."
canonical: https://animalchecklist.com/animal/oldfield-mouse
last_updated: 2026-09-20
---

# Oldfield Mouse

> Peromyscus polionotus — Mammals. The oldfield mouse, oldfield deermouse or beach mouse (Peromyscus polionotus) is a nocturnal species of rodent in the family Cricetidae.

- Scientific name: *Peromyscus polionotus*
- Category: `mammals` (Mammals)
- Habitats: `grassland` (Fields & meadows)
- iNaturalist observations: 134
- Wikidata: [Q575053](https://www.wikidata.org/wiki/Q575053)
- iNaturalist taxon: [44399](https://www.inaturalist.org/taxa/44399)

## Names

- en: Oldfield Mouse
- de: Küstenmaus
- es: Ratón de playa
- fr: Souris de plage

## Countries with the most observations

US (38)

## Summary

The oldfield mouse, oldfield deermouse or beach mouse (Peromyscus polionotus) is a nocturnal species of rodent in the family Cricetidae. It is a species of the genus Peromyscus, a closely related group of New World mice often called "deermice", that primarily eats seeds. It lives in holes throughout the Southeastern United States in beaches and sandy fields. Predators to these mice include birds and mammals. In 2016, these mice were in the least concern category on the IUCN Red List with certain subspecies classified as extinct, critically endangered, endangered or near threatened.

Text: Wikipedia (en), CC BY-SA 4.0 — https://en.wikipedia.org/wiki/Oldfield_mouse

## Photo

![Oldfield Mouse](https://animalchecklist.com/img/animals/oldfield-mouse/medium.jpg)

Photo: cwarneke · CC0 · inaturalist — https://www.inaturalist.org/observations/6793994

## Machine access

`GET https://animalchecklist.com/api/v1/animals/oldfield-mouse?lang=en` — see [openapi.json](https://animalchecklist.com/openapi.json).