I heard the May 25th update added a Copper Dragon. Which dragons do I need to breed to get one and how long do they take to breed?
Here are combinations that have all have the fastest "failure rate." Meaning the average time wasted if you don't successfully breed a copper dragon is only 2.45 hours.
Breeding Combination 1: CactusDragon + CopperDragon Failure Average: 2.25 hrs
Breeding Combination 2: CactusDragon + MagneticDragon Failure Average: 2.25 hrs
Breeding Combination 3: CactusDragon + MetalDragon Failure Average: 2.25 hrs
Breeding Combination 4: CopperDragon + PlantDragon Failure Average: 2.25 hrs
Breeding Combination 5: MagneticDragon + PlantDragon Failure Average: 2.25 hrs
Calculations done at http://dvcalc.pf-control.de/
Here's how to breed a Copper Dragon:
The Dragonvale Wiki page explains:
The Copper Dragon can be bred by selecting a metal dragon to mate with a lightning dragon at the Breeding Cave/Epic Breeding Island.
You don't need any hybrid dragons, just Metal and Lightning dragons.
You'll know you have a Copper Dragon when you get a breeding/egg time of 20 hours. Alternately you may get a Magnetic Dragon with a breeding/egg time of 4 hours.
Copper Dragon eggs look like this:
And the baby will look like this:
All images from Dragonvale Wiki: Copper Dragon