One of the first guppies that we bought was a very pretty yellow/gold female with a bright orange tail fin, all other fins were clear.  Since it was soon evident that she was pregnant, we bought another 10 gal tank for home.  <sigh>  The fry were born Nov 24, 2004.  The fry (or are they juveniles now?) are about 12.5 weeks old.  The momma fish was large and had about 30 fry.  The fry were tiny dots.  Several days later, the fry were large enough that we could see that they were a pinkish/peach color.  Eighteen are still alive - 4 females, 13 males, and a little mutant.  The larger males started showing color about 2.5 wks ago.  Now 12 males are very colorful (the smallest male is developing a yellow tint on the bottom of his caudal fin) and have very similar coloration and seem to be getting their color in the same order.

First the bottom of the caudal fin turned yellow, then the top of it turned bright orange/red (the middle part being clear), at about the same time orange/red patches appeared on the body, then a black crescent on either side of the tummy (a bit forward of the gravid spot in females) that changes size (crescent, small spot, or disappears altogether), then thin brown lines developed starting behind each eye and extending to the dorsal, the dorsal fins all have some black on them mixed with either orange or yellow, and in the last couple of days they are more iridescent -with their sides looking sometimes green or blue.  A couple of them appear to be developing purple or blue on their body (peduncle) at the base of the caudal fin.  The parts of their bodies that aren't vividly colored are copper and the pectorals are clear.  The caudal fins are more triangular than fan shaped.  The females are large and copper colored with a bit of a light blue tint on all fins (OK I can't really see the pectorals, they could be clear :).  

The reason we thought the first lot of fry might be a guppy/Endler's mix is the black crescent (we've seen the same marking on pix of Endler's but not on any guppies) and vivid orange patches.  Sadly, the pretty momma fish died.

We rescued another very plain, very pregnant female from Wal-Mart.  Her fry were born the next day Jan 10, 2005.  They will be 5 wks on Feb 21st.  Anyway, this female was very small, not much bigger than the 7 wk old female fry.  She had 12 fry and they were huge compared to the first lot of fry.  Right away we could see that they were silver and black.  They grew very rapidly.  The males are now the same size as the smallest male from the first lot of fry.  About 2 weeks ago the <B>whole</B> tail fin on the larger males started to become very lightly colored (blue or yellow). Some have black streaks in their dorsal fins and pectorals.  The 2 females are a bit bigger than the males (in the first lot, the females are still almost double the size of the males) and are still silver and  black.

The 9 males were moved a few days ago from a 2.5 gal to the 10 gal with the older male fry.  The 6 females are in the 2.5 gal (we're looking for a bigger tank).