Yea, animals are always attracted to the cameras. I think they can hear it charge the flash a lot of times. I am always getting shots from animals looking into the lens.
With cattle I think they either smell our human scent or the salt from our sweat on the TC or feeder. I do know that the IR type cameras make "noise" then the animals curiosity takes over at that point. I had cattle in West Texas knock a TC out of mesquite and it was finally found 2 months later about 90' from the location it had been.