In January of this year we had some very warm weather and I managed to come across a spotted salamander congress (like a murder of crows) and then they laid eggs for a few weeks and are now happy little axolotl looking things!
The pond is just about a year old and is about 8x8 feet and ~3.5 ft deep at the deepest.
great photos! I would love to have a little ecosystem like this near me.