  Consider nonlinear Choquard equations \begin{equation*}
\left\{\begin{array}{rcl} -\Delta u +u & = &(I_\alpha*|u|^p)|u|^{p-2}u \quad
\text{in } \mathbb{R}^N, \\ \lim_{x \to \infty}u(x) & = &0, \end{array}\right.
\end{equation*} where $I_\alpha$ denotes Riesz potential and $\alpha \in (0,
N)$. In this paper, we investigate limit profiles of ground states of nonlinear
Choquard equations as $\alpha \to 0$ or $\alpha \to N$. This leads to the
uniqueness and nondegeneracy of ground states when $\alpha$ is sufficiently
close to $0$ or close to $N$.
