Lake Eyre is big all right! It’s quite shallow so the water body moves depending on the wind. Fresh water coming in has a different colour from the salt water and apparently the pink colouring in the shot below is small shrimp things.
Fresh water fish washed in with the rivers can't survive the extremely salty water. Water birds (seagulls and pelicans in the middle of the Australian desert) somehow know this is all happening and arrive to feed on the feast where the fresh water joins the salt. However, the expected big influx of birds was not here … there is so much water and greenery elsewhere they don’t need to come to the lake . We saw just a few pelicans on Cooper Creek.
The bottom shot is of Lake Eyre south. It is not getting overflow from the North but had quite a lot of water in it nonetheless because of local rainfall.