One of my Imitating Dart Frog pairs (Dendrobates or Ranitomeya imitator) laid their first egg, just one in January. Here it is, and as you can see it is developing. Sorry for the quality of the photo - they laid it at the base of recessed bromeliad leaf and I couldn't actually look at it directly, had to hold the camera inside the terrarium! Oh, my imitators are the Tarapoto race (as in Tarapoto, Peru).