A number of these are looking quite solid. Just a couple things to keep in mind:

• When adding additional forms, try to integrate them into one another, like a three dimensional puzzle. So looking at cases like the belly and hip and rump here, you've got little gaps between them. Try and think about how they're all representing muscle groups, and how they'd fit together. You're doing a good job of this with many of your heads, so apply the same principle here.

• I really love the additional mass you drew just at the base of the neck (along the spine) of this horse. It captures exactly how these masses ought to carry a sense of thickness and mass. This is missing towards the rump, where you've smoothly integrated the addition there into the profile of the rest of the torso. I've demonstrated this concept in this quick demo for another student.

• In this chicken and in a few other cases, you've put down an underlying construction, and then wrapped the whole construction (or in other cases, part of the construction) in a sort of enveloping 2D shape. This is absolutely not how you should be approaching situations where you want to add bulk or volume - you do this by adding additional forms, wrapping them around the underlying construction, and ensuring that every component has a clear relationship with its surrounding forms in 3D space. The moment you treat your drawing as a flat collection of lines and shapes, you sacrifice the illusion that what you're drawing is 3D. Here's an example of the difference in the approaches.

Anyway, all in all I think you've got a lot of big successes. I especially liked your horse, your gazelle, and the frog was an excellent example of the use of the sausage method. There is of course room for growth and improvement, but you're headed in the right direction, so I'll go ahead and mark this lesson as complete.