I feel that you strayed from the sausages that are requested in the organic intersections: (https://drawabox.com/lesson/2/5/simplesausage), and that kind of difficulted that homework somewhat. So, in the future, try to always stick to simple sausages.

And talking about sausages, when drawing legs, you don't necessarily have to modify the sausage size. You can try drawing them in a consistent way (in relation to the others, and not drawing one bigger or smaller) and then add additional masses to it. This technique can be useful some times, although the constant adding of masses can be perjucial to your drawing if you don't think on how they relate to each other (as happened to me in my submission).

Now, one important think in drawabox is the solidity of your drawings; there are some cases where you didn't cimented your textures or extra muscles with mass (like in the boar, where you just connected masses with a line). Some demos are outdated, but that doesn't mean that you should stray from the method. Applying construction to everything is one of the core parts of the method, that's why you should do it.

Another thing you should improve are your heads. The initial thing you draw is the cranium, and attach things to it; you generally draw it like a circle. If you draw it too big, it can be difficult to adjust it with the rest of the body, and so it'll end up looking kinda weird. Cause that, trying the look in your reference the actual cranium of the animal is helpful, as you can see what you can add as an extra mass (or is actually an extra mass), and what is the core part of the head, and that also helps to estimate how big you are gonna draw it. It's better (I think) to draw it smaller, because you can draw things to it.

Your drawings overall look solid, but there are some where you added more texture than necessary, and in black values. Just recall that texture is not that important, and that in doing that you generate a lot of contrast, which is not the focus here.

One last thing is that you filled some places with pitch black (like in your oryx and tiger) and that that, as well, generate a lot of contrast, and just because the color corresponds it doesn't mean you should do it. So be careful with that.

So I think that, in the future, you should focus on maintining you solidity as good as possible! Good job!