Semipalmated plover

Like many other shorebirds, semipalmated plovers breed in the Arctic and sub-Arctic regions of North America, ranging from Alaska to Nova Scotia. Their breeding season lasts from early May to late August. Using consistent seasonal migratory routes, they travel to North, Central, and South America for the winter. When migrating through the United States, semipalmated plovers stop at lakeshores, ponds, or flooded fields, such as those found in the Delaware Bayshore area.

The primary diet of semipalmated plovers is carnivorous, including mollusks, insects, non-insect arthropods, aquatic crustaceans, and marine worms (particularly during migration and in winter). Opportunistic feeders, these plovers will also consume seeds, grains, and nuts.

Like many plovers, semipalmated plovers sometimes utilize a technique called foot-trembling to capture their prey: the motion of tapping or trembling one leg disrupts invertebrates in the ground. The startled invertebrates move to the surface, where they are then easily caught by the visually-minded plovers.

During breeding season from May to August, semipalmated plovers are monogamous. Mates pair up on breeding grounds, where males perform a butterfly-like fluttering courtship display to delineate their territory and attract females. An average clutch sizes is 4 eggs, which are incubated by both the male and the female for almost one month. Studies indicate that pairs may stay together in later seasons.

Semipalmated plover chicks are precocial, meaning they can walk and feed within hours after hatching. The parents continue to brood the chicks for up to 5 days. About 2 weeks after the chicks have hatched, the female leaves and the male stays as the sole guardian of the nest. Between 3 and 4 weeks after the eggs have hatched, the chicks are fully fledged.

In New Jersey, semipalmated plovers are not listed as threatened or endangered. However, there are current efforts to protect major migratory stopover sites for plovers and other shorebirds. Furthermore, efforts are being taken to minimize disturbance during breeding seasons in the Arctic, such as minimizing ATV activity and vehicle pullover onto roadside nesting habitat.