Tub test tube baby is a period- 2 oscillator. It is similar to test tube baby, but tubs are used to stabilizes the corners.
Tub test tube baby is about the twenty-ninth most
common naturally-occurring oscillator in Achim Flammenkamp's census, being less common than the tumbler and more common than trans-beacon on dock. It is the 29th most common oscillator on  Adam P. Goucher's Catagolue. There are about four regular test tube babies for every three tub test tube babies.
A honey farm hit a certain way, with several possibilities, produces a tub test tube baby (click above to open LifeViewer)
All strict still lifes with a population of 20 or fewer cells, as well as all oscillators and spaceships with 16 or fewer cells, are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.
16P2.86 at Heinrich Koenig's Game of Life Object Catalogs