dawn tree
If you photo Ichtyosaur when it's above water and then goes back into the water, it creates a sound bug that persist outside of Mezozoic Valley, in Beyond or during the main evolution, sometimes even when you restart the app (you have to do a full shutdown in that case in the settings).
P.S I'm not sure if it happens if Ichtyosaur is in the water, but I dont think it has to be above the water for this sound bug to occur.