Hello! My job has changed and I rarely get to dip into Blender so I am starting a side project to regain some skills.
The first challenge that has stumped me is the rear leg of the green lion. I started this with a UV Sphere (just using the top) and then started again with a Cylinder but am wanting to know the smartest way to model the Screw-like hip with the slot carved down the middle. I am attaching an image of the part circled in yellow for better reference.
I could brut-force something but would rather learn from the best.
Yeah, I realized a couple other angles would have been useful. That’s the one I’m using as my Front view.
??
You need to supply a better image for us to help you!!
Good luck.
You may show what you have already achieved and so one may give a hint where you may change your workflow.. because starting something “round” with some circle is… 
obvious ??
In fact there are a lot of models to look at in wireframe mode for example on SketchFab..
to us as some reference…