The Starling was a small American nuclear bomb developed in the 1950s that was used as the primary in several US thermonuclear weapons.
The Starling was developed by Lawrence Livermore National Laboratory.
According to researcher Chuck Hansen, it was 11.53 inches (293 mm) in diameter, 14.25 inches (362 mm) in length, and had a weight of 86.4 pounds (39.2 kg).
[1] It was a two-point primary, like Tsetse, Kinglet, Robin, and Gnat.
[1] Starling is reportedly the primary for the W55 (which also used Kinglet) and W56 warheads.