Hi all! This seems to be the million dollar question! I appreciate there is no definitive way of doing this over the internet but any advice I can get from those more experienced than us would be much appreciated! I've taken some varying pics to assist! Ok we've had our 2 Muscovies for roughly 2 months now - LOVE them! They are brilliant. When we got them we had them vent sexed and went away with 2 girls, Peggy (black and white) and Dot (black). One was over a month older than the other, and the younger was smaller than the older - so far, all as it should be! However, recently the younger seems to have had a massive growth spurt and has now outgrown and outweighs the older. (Black and White is 2.1kg to 1.8kg). We are starting to suspect that Peggy may be a Peter... From the many hours of research we've done, we understand there are certain traits that give clues to what sex they are, and these are the differences we've noticed (I'll use their colour so you can tell which one's which in the pics!) -Obvious size difference Black and White is longer, seems a bit taller, we think feet are bigger, the smaller also seems more "dumpy" if that makes sense) -Black and white seems much more gutsy and adventurous whereas black seems quite shy -Black got her proper feathers and flight feathers way younger than Black and White developed them (accounting for the age difference!) The carunkling and voices are not at a stage where we can tell any definite difference yet - both are still "cheeping" although Black does sound a little "honky" (My I am coming out with some funny words today...!) We are now looking obsessively for the differences so may be reading too much into it, but really this growth spurt was quite alarming, is it normal for younger ducks to outgrow older ones? And so quickly?! Here are the pics... do excuse the quagmire of a garden and the state of our moulting chooks! (Got to love winter!) Thanks in advance for any advice, if what we suspect is true we obviously need to alter our plan somewhat!