Mariana Swiftlet

Aerodramus bartschi

Order

APODIFORMES

Family

Swifts (Apodidae)

Code 4

MASW

Code 6

AERBAR

ITIS

Egg Color:

White



Number of Eggs:

1



Incubation Days:

12



Egg Incubator:

Unknown



Nest Location:

On wall of cave or tunnel.



Nest Material:

Saliva and feathers.



Migration:

Nonmigratory



SPONSORED ADVERTISEMENTS

General

Mariana Swiftlet: This is a small swiftlet with dull, sooty, mostly dark brown-gray plumage on the head and upperparts and a white-gray throat and upper breast. Its lower underparts are a dark gray-brown and lack shaft streaks; tarsi bare or lightly feathered; supraloral patch is missing or reduced. It has a very short, black bill and a shallow forked tail. Its plumage lacks a distinctive sheen or gloss. There is no distinction in plumage between the sexes. Research suggests they are possibly capable of echolocation.

Breeding and Nesting

Mariana Swiftlet: Nesting occurs year-round, and peaks from late January to September. They build their nests on the walls of limestone caves. The nests are built out of moss and fastened to the sides of caves with the bird's saliva. The nests are very small, just over two inches in diameter. The female usually lays only one egg in the small cup nest. The incubation period lasts for 12 days.

Foraging and Feeding

Mariana Swiftlet: These swiftlets are insectivores. They forage over coastal and interior forest and grasslands, and around mangroves, preferring the forests on Guam and Aguijan. They have narrow wings for fast flight, with a wide gape and small reduced beak surrounded by bristles for capturing small arthropods in flight.

Vocalization

Mariana Swiftlet: Utters a series of clicking noises.

Similar Species

Mariana Swiftlet: No other small, dark swift occurs in the Hawaiian Islands. Chimney and Vaux's Swifts have more rounded tails.

.
UnderpartsX

Belly, undertail coverts, chest, flanks, and foreneck.

UpperpartsX
Back, rump, hindneck, wings, and crown.
BreastX
The upper front part of a bird.
GapeX
Also called commissure, it is the hinge where the mandibles meet.
Parts of a Standing bird X
Head Feathers and Markings X
Parts of a Flying bird X