[cobirds] Identification for these adorable birds

I took a photo this morning at the Denver Audubon Nature Center this morning of these adorable birds but I have not figured out what it is. Any help would be appreciated!

This next one could be a Northern or a Loggerhead Shrike. I'm not sure. Something in that direction caught my attention to its beautiful song. I didn't see if it was this bird or another though. It was high up in a tree and 100 yards away.

Thanks for any help you can offer 

- Brian

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