Fig. 4
From: The Grey-backed Shrike parents adopt brood survival strategy in both the egg and nestling phases
Frequency of different food types that parents deliver to their offspring in the Grey-backed Shrikes (black column), as well as the Brown-cheeked Laughing Thrushes in their first (blank columns) and second breeding attempt (red columns). Data supporting this result are provided in Additional file 1: Table S2