Mallards are a widely recognized species of waterfowl, common across North America, Europe, and Asia. They inhabit diverse climates, from arctic tundra to subtropical regions. Their adaptable nature leads to curiosity about their daily habits, particularly where and how they rest.
Where Mallards Rest
Mallards exhibit flexibility in their choice of resting locations, utilizing both aquatic and terrestrial environments. They commonly sleep while floating on ponds, lakes, and slow-moving rivers, allowing them to drift with the water, or frequently rest on land near water, such as sheltered banks, isolated mudflats, and sandbars. They often seek out areas with dense vegetation, including reeds and cattails, which provide cover. While often found near water, mallards can also rest in fields, especially agricultural ones, if they are close to a water source. They are not especially selective about their sleeping spots, often settling wherever they are at the end of the day or when seeking temporary respite.
Why Location Matters
The selection of a resting location for mallards is influenced by factors that enhance their safety and comfort. Choosing spots with open views, such as isolated mudflats or sandbars, allows them to detect predators early. Dense vegetation offers concealment from threats, providing a secure place to rest. Sleeping in groups provides an added layer of safety, as more individuals contribute to vigilance. Weather conditions also play a role, as mallards seek sheltered locations to protect themselves from wind, cold, and rain, conserving body heat, and resting spots are often chosen near abundant food sources.
How Mallards Sleep
Mallards do not typically sleep for extended periods; instead, they engage in frequent short naps throughout the day and night. A notable adaptation is unihemispheric slow-wave sleep (USWS), where one half of their brain rests while the other remains active. This allows them to keep one eye open, remaining alert to their surroundings even while sleeping. When sleeping in groups, mallards positioned at the edges exhibit USWS more frequently, often directing their open eye away to watch for danger. Mallards also tuck their head under a wing to conserve body heat and for comfort, and may stand on one leg to reduce heat loss through their unfeathered limbs in cold conditions.