While rice is okay for birds, many wedding parties now throw bird seed instead. Birds can choke on peanut butter. However, mixing peanut butter with grit or cornmeal will break up the stickiness if you are concerned.
Birds become dependent on bird feeders.
However, birds search for food in many places, so if your feeder goes empty, most birds will find food elsewhere. Birds' feet can stick to metal perches. A bird's legs and feet are made up mostly of tough tendons that have little blood flow during cold weather. Feeding hummingbirds in late summer can stop their migration. In fact, your feeder might provide a needed energy boost along a bird's migration route.