Rhinoceros Auklet or Ancient Murrelet?

Ancient Murrelet Characteristics

General appearance: The Ancient Murrelet is a small seabird with a distinctive appearance. Adults are characterized by a striking dark gray body contrasted by their white face and throat. Their wings and back are a deeper slate gray, while their underparts remain lighter. They have slim, short tails and relatively long wings. The bill is small, yellow, and sharply pointed. Male vs Female: In the Ancient Murrelet, there are minimal differences between males and females, both possessing similar coloration and size. This similarity makes it challenging to differentiate between the sexes in the wild without a closer inspection. Juvenile: Juveniles differ from adults in their overall duller appearance, lacking the defined white facial markings seen in adults. Their plumage tends to be more mottled and mixed with browns and grays, which provides better camouflage. As they mature, they gradually acquire the distinct coloration of the adult birds. Juveniles might also have slightly shorter and duller yellow bills compared to adults. In the wild, Ancient Murrelets can often be recognized by their rapid, fluttering flight near ocean waters along rocky coastlines. Seasonally, they might appear slightly heavier before breeding or maintain molted plumage during post-breeding.

Primary habitat

Ancient Murrelets primarily inhabit rocky coastal regions across the North Pacific from the coasts of Alaska to the Sea of Japan. They are typically found in cold, temperate marine environments where they nest in underground burrows on forested islands. The murrelets are known for their tendency to nest in dense colonies in these secluded coastal areas.

Additional range

These birds occasionally adapt to localized conditions beyond typical confines, appearing further south as occasional visitors along North American and Asian Pacific coastlines. Unexpectedly, they may venture into more human-disturbed areas if nesting conditions are suitable. Increased transport and climate shifts occasionally influence their range expansion.

Natural diet

In their natural habitat, Ancient Murrelets primarily feed on small fish, plankton, and various crustaceans. These seabirds hunt close to the surface, diving into the ocean to catch prey like capelin, Pacific sand lance, and krill. They often forage in coastal waters and are known to travel long distances following food availability. Feeding habits vary seasonally. During spring, they rely heavily on abundant krill and copepods. In summer, the diet remains diverse with a focus on juvenile fish that are abundant in these months. This helps them efficiently meet the energy requirements for breeding and chick-rearing.

Bird feeders

Ancient Murrelets are not typically attracted to traditional backyard bird feeders, as their diet primarily consists of marine life. However, while they might not frequent feeders, they can occasionally be found in coastal areas where people provide food scraps or fish bits. Since these birds feed at sea, customization of bird offerings would not significantly impact their feeding patterns. For those interested in observing Ancient Murrelets up close, providing access to clean water or ensuring a healthy marine environment nearby is more beneficial than standard backyard bird feeders. Overall, they are best observed in their natural maritime settings rather than seeking alternative foods from terrestrial sources.