The ornamental design for electronic butterfly, as shown.
FIG. 1 is a front perspective view of an electronic butterfly showing my
new design; FIG. 2 is a rear perspective view thereof; FIG. 3 is a right
side elevation view of one side thereof; FIG. 4 is a left side elevation
view of one side thereof; FIG. 5 is a rear elevation view thereof; FIG. 6
is a front side elevation view of the other side thereof; FIG. 7 is a top
plan view thereof; and, FIG. 8 is a bottom plan view thereof.