This illustration, drawn by Robert
Kretschmer sometime before 1872, depicts a male thylacine attempting to
subdue a inexplicably oversized platypus (Ornithorhynchus anatinus).
Although Tasmanian platypus are in fact considerably larger than average,
with some adult males weighing up to 3 kg. (6.6 lb), they certainly do
not come close to reaching the fantastic scale illustrated below.
Incidentally, no platypus predation by thylacines has ever been observed
Another thylacine illustration by Kretschmer
can be viewed here.