Both of those images look a little over exposed. Managing the white level in bright light can be a challenge because they are easy to blow out. Small amounts can be recovered in post depending on the software. Lightroom handles this pretty well but you may need to use the histogram.
Form a purist standpoint, blowing out the whites on a white bird subject is a fatal flaw, and it's a bad decision to try to expose to the right to the point where it is blown even a small amount. In these images there are no shadows that you are looking to brighten - all you have is midtones, lights and whites that are overexposed. Unless you have a wide dynamic range or important shadow detail, there is no real need to expose to the right. You have 12 stops of dynamic range in the D7200, and the scene has about 8 stops of dynamic range. Raising the ISO to achieve an Expose to the right strategy adds noise and reduces dynamic range of the file without accomplishing anything.
Blooming or overspilling blown out areas is normal. That's part of why it can be so hard to recover overexposed images. The camera is working as designed.
Part of the problem is you are using an automated metering mode for this subject. That makes it harder because the degree to which the white bird fills the frame varies. The green background is slightly below a neutral gray tone, and the white great egret at least two stops above neutral. So whatever exposure you pick is going to vary a lot depending on the size of the bird in the frame. Center Weighted or Protect Highlights metering selections can get closer, but won't eliminate the problem. You are using exposure compensation which can help, but it's going to change as the size of the subject in the frame changes.
For this kind of subject and situation, Manual exposure mode can be useful. You can create a test image using Aperture or some other automated setting and simply lock in those settings. Or you can spot meter the white bird and add two stops. Either way works, and as long as your subject or subjects are in the same level of light, every exposure will be correct regardless of framing.