Emu

An emu is a Herschel loop which does not emit gliders. Emus have been constructed for period 52[1] and for periods 54 and higher (the first few are oscillator-assisted). Quetzals have also been constructed for each of these periods.

See Simkin's p60 for a small example at the size of only 33×31.

Etymology

The name derives from the fact that they are flightless (incapable of emitting gliders). This term was coined by David Buckingham.

Emus as reflectors

Emus can be used to reflect gliders in a variety of ways. Adam P. Goucher (with help from Jason Summers) exploited this property to construct the first period-59 gun. Unfortunately, that method does not generalise to the remaining emu-only periods, since it uses a special p59+15n reaction based on David Buckingham's p44 oscillator.

gollark: Fake loading screens are the enemy of mankind.
gollark: Why does it do `sleep` while iterating over the files? That seems like a waste of time.
gollark: How does that even do anything? Where do you *set* listenBreak? Where does the "key" value go?!
gollark: That seems like a really weird way to do things.
gollark: Listening for events yields like `sleep` does, so it'll work fine.

References
  1. Adam P. Goucher (March 3, 2018). "Re: Oscillator Discussion Thread". Retrieved on March 3, 2018.
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