Probably this is because the ostrich doesn't need to be as intelligent. No flight, big clumsy beak etc. And they can avoid predation just by being huge and kick

Probably this is because the ostrich doesn't need to be as intelligent. No flight, big clumsy beak etc. And they can avoid predation just by being huge and kicking really hard. City birds like crows and pigeons have puzzles they can play with like getting food out of garbage bins and so on. City birds tend to be more intelligent than countryside birds, even within the same species. I always felt like cats are actually smarter than dogs in a lot of ways. Dogs have a lot of their brain power dedicated to manipulating and communicating with humans, as well as trainability. But untrained dogs just seem kinda stupid and helpless to me whereas cats can learn to be almost completely independent with next to no training. Dogs are evolved from pack animals of course which explains a lot of this. I do love dogs though, just to be clear.