"Source, please.
When birds eat rice, the rice grains can absorb moisture in the bird’s digestive system and swell, potentially causing blockages or other digestive issues12. Rice contains high levels of carbohydrates, which can be a challenge for birds to digest due to their short digestive tracts1. However, the idea that feeding birds rice will cause them to explode is a myth234. In fact, many birds, particularly migratory ones, have rice as a regular part of their diet3.
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Source: Bing. Fewer Sources: chipperbirds.com, birdhour.com, and learnbirdwatching.com