The spotted sandpiper (Actitis macularius) is a small shorebird. Together with its sister species the common sandpiper (A. hypoleucos), it makes up the genus Actitis. They replace each other geographically; stray birds may settle down with breeders of the other species and hybridize. Adults have short yellowish legs and an orange bill with a dark tip. The body is brown on top and white underneath with black spots. These spots vary in degree over the course of spotted sandpipers' lives, becoming especially prevalent around the breeding season. The overall health of spotted sandpipers may be suggested by the 'spottiness' of an individual. Generally, females with more 'spottiness' were healthier than those who did not have as many spots. The condition of males based on the amount of spots they exhibit is yet to be determined. Additionally, spot size gets smaller and the spot shape becomes more irregularly shaped as age increases. Spotted sandpipers also feature a white supercilium. (Source: Wikipedia.org, CC BY-SA)