A wintertime diet We all know that many birds in north Texas eat insects. But what do they eat in the winter? Winter doesn’t kill all insects permenantly. Actually, cold weather doesn’t eradicate insects since their bodies are very different from a human’s. Also, insects survive as larvae and eggs - tiny objects on things like the undersides of bark and fallen leaves. Birds know where this food source can be found, which is why you see birds endlessly poking through leaf-litter on the ground.