Here's my nesting Tree Swallow. The male always watches over the nest box from a nearby tree and brings his sweetie some food while she's nesting.
A personal favorite is the Rose-breasted Grosbeak. They are at the feeders from morning to night. They sing such sweet songs.
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I've finally been successful in attracting the Orioles (jelly, mealworms, orange sugar water and orange slices do the trick.) They are definitely the most spoiled bird at my cabin.
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What birds are you seeing? What is your favorite?