Carnotaurus was in the mood for poultry by the seaside, so he opted for these primitive penguins.

The oldest fossils found for the penguin order Sphenisciformes date back to 62-60 million years, or less than five million years after the non-avian dinosaurs' extinction. Some researchers estimate that penguins as a distinct lineage may go even further back to 70-68 million years in the Late Cretaceous, making them contemporary with dinosaurs like T. rex, Triceratops, or the South American Carnotaurus. Given this, I think it possible that dinosaurs in the Late Cretaceous Southern Hemisphere might have munched on the earliest penguins.

On a semi-related note, looking up what penguins' mouths look like when open is not the most visually pleasing experience. Their tongues actually have spines on them!