Memorandum Rodentium

The origami Rat memos, Cleverly named Memorandum Rodentium Are used bij MACUSA in the 1920's

Rat Memos (Memoradum Rodentium)
These were designed as flat artwork by the graphics team, then worked up by the prop department before being finally brought to life by the VFX department, with the memos flying upwards before scurrying off along the piping to deliver themselves, although in one shot, two rats come upon each other and start squabbling. An origami magiscal rat that scuffers along the pipes to bring the memos to MACUSA employees
 * Fantastic Beasts and where to find them
 * An Origami rat like magical memo.
 * Used by MACUSA during the early 1920's