We study the $(k+1,k)$ diagonal map for $k=2,3,4,...$. We call this map $Δ_k$. The map $Δ_1$ is the pentagram map and $Δ_k$ is a generalization. $Δ_k$ does not preserve convexity, but we prove that $Δ_k$ preserves a subset $B_k$ of certain star-shaped polygons which we call $k$-birds. The action of $Δ_k$ on $B_k$ seems similar to the action of $Δ_1$ on the space of convex polygons. We show that some classic geometric results about $Δ_1$ generalize to this setting.