Swan is a c/4 diagonal spaceship producing some useful sparks. It was found by Tim Coe in February 1996. On February 20, 1996 Noam Elkies noticed that it could be made into a small boatstretcher. It can also be combined non-trivially with a Canada goose. In November 2000 Jason Summers found a period-8 glide-reflective tagalong for two swans. This was the first c/4 diagonal spaceship with a period other than period-4 to be found.
A version stretching a tub (instead of a boat as shown below) was called TIRETRAK.LIF in Alan Hensel's lifep pattern collection from the 1990s; this was at a time when PC-compatible computers running older versions of MS-DOS were still limited to eight-character filenames.
- 49P4H1V1.1 at Heinrich Koenig's Game of Life Object Catalogs