Mammals Most active at dawn and dusk

Coypu

Myocastor coypus

iNaturalist Wikipedia

With their vibrant orange teeth and impressive swimming skills, the coypu is a fascinating giant of the wetlands. Often mistaken for beavers, these social South American rodents have become iconic sights in waterways around the world.

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Quick Identification

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Size

40-60 cm (16-24 in) body length plus a 30-45 cm (12-18 in) tail; weighs 5-9 kg (11-20 lbs)

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Colors

Coarse reddish-brown or yellowish-brown guard hairs with a dense grey underfur; features a distinct white patch on the muzzle

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Key Features

Large, bright orange front incisors
Long, cylindrical, scaly tail
Webbed hind feet for swimming
Prominent white whiskers on a blunt muzzle

When You’ll See Them

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Activity pattern Most active at dawn and dusk

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Peak hours 5-9 PM, 5-8 AM

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Season Year-round

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Diet Strictly herbivorous, consuming aquatic plants, roots, rhizomes, and tubers; they often eat the base of plants, wasting the rest.

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Habitat Freshwater marshes, riverbanks, lakeshores, drainage canals, and sluggish streams.

public Geographic range

Where Does the Coypu Live?

Native to the southern half of South America, the coypu naturally thrives in the wetlands of Argentina, Chile, Uruguay, and southern Brazil. Because of its history in the fur trade, the species has been introduced to almost every other continent, establishing large, permanent populations across the southern United States, much of Western Europe, and parts of East Asia. They are most successful in temperate and subtropical climates where water sources do not freeze deeply in winter.

Basemap © OpenStreetMap contributors

9 Countries

2.5M km² Range

Least Concern Conservation

AR Argentina CL Chile BR Brazil UY Uruguay US United States FR France IT Italy DE Germany CN China

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iNaturalist / Verified observation data

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Behavior

Coypus are highly social, semiaquatic rodents that spend the majority of their lives in or near the water. They are excellent swimmers, aided by their webbed hind feet, and can remain submerged for several minutes while foraging. While they can be active during the day in quiet areas, they are primarily crepuscular, meaning they are most active during the twilight hours of dawn and dusk. They are known for their vocal nature, often communicating with family members through a variety of grunts, whistles, and pig-like squeals.

These rodents are industrious burrowers, often excavating complex tunnel systems into the banks of rivers, ditches, and marshes. These burrows usually have multiple entrances, some of which are located underwater. In addition to burrowing, they may build large nests or platforms out of floating vegetation for resting and feeding. In social structures, they typically live in small groups consisting of a dominant male, several females, and their offspring, though young males may be solitary until they establish their own territory.

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Camera Tips

To capture the best footage of a coypu, position your camera at a very low angle, no more than 6 to 12 inches off the ground. These rodents stay close to the waterline, so look for 'runs'—distinct, muddy paths where the grass has been flattened by their heavy bodies as they move between the water and their feeding grounds. Placing your camera along one of these runs, angled slightly toward the water, will provide a great profile view of the animal.

Since coypu are most active during low-light hours, a camera with high-quality infrared (IR) night vision is essential. They are naturally curious and may approach the camera to sniff it, so ensure your device is securely strapped to a post or a tree to prevent it from being knocked over. If you aren't seeing much activity, try using a small amount of 'bait' like sliced sweet potatoes, carrots, or apples placed on a flat, dry spot in front of the lens. This will encourage the coypu to pause and eat, giving you a much clearer and longer video clip than a simple walk-by.

Pay close attention to water levels when setting up. Coypu habitats are prone to flooding or tidal changes; a camera submerged in a sudden rise of water can be ruined. Aim for a spot that is just above the high-water mark. In the winter, focus your efforts near the entrances of burrows in the muddy banks, as they tend to range less widely in cold weather. Check your settings to ensure a high trigger speed, as they can swim past surprisingly fast when they aren't foraging.

Similar Species

Species that look similar or are commonly confused with Coypu.

Muskrat

Muskrats are significantly smaller (1-2 kg) and have a vertically flattened, ribbon-like tail compared to the coypu's larger size and round tail.

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Frequently Asked Questions

Coypu are primarily crepuscular, which means they are most active during the dawn and dusk hours. However, in areas where they feel safe and undisturbed by humans or predators, they can frequently be seen foraging during the day.

If you live near a waterway, you can attract coypu by providing high-carbohydrate treats like sweet potatoes, carrots, or corn. Placing these near the water's edge on a clear, flat patch of ground will often draw them out of the reeds for a photo opportunity.

Coypu are herbivores that specialize in aquatic vegetation. They eat the roots, stems, and leaves of plants like cattails, water lilies, and reeds. They are known for being 'wasteful' feeders, often digging up an entire plant just to eat the succulent base and discarding the rest.

Yes, coypu are very adaptable and often thrive in suburban areas that feature drainage canals, golf course ponds, or decorative lakes. As long as there is slow-moving freshwater and plenty of vegetation, they can live quite close to human developments.

The easiest way to tell them apart is the tail: coypu have a long, thin, rounded tail like a giant rat, while beavers have a broad, flat, paddle-like tail. Additionally, coypu have white whiskers and bright orange teeth that are often visible, whereas beavers have dark whiskers.

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