To the person who asked, Phoenixes eat Sulfur. Please everyone knows let everyone know :)

Really the thing that’s hard with them is finding them as they can be anywhere on the map and that only around three spawn and the fact they only spawn during heat wave. If you find one don’t lose it when it falls to the ground build a six foot high cage around it. If you hav le actually trapped it use a fire wyvern as they are the most effective but arrows and flamethrowers work as well

You can get it to spawn next to your base because of the following: It always respawns at it's last location, so if the heatwave ends while you are following it you will know where it is for the next heatwave. It also chases you when you eat flowers... hint hint

When tamed it only eats sulfur nothing else

You can look for it with a parasaur when heatwave isn active...it can detect an ash pile...i got lucky and found one after 5min