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Some form of large Ant (about the same size as a carpenter ant) that appears to be laying eggs in a couple branches of my ornamental tree.
They *are* carpenter ants, but they are tending aphids, not laying eggs. The aphids are the yellow objects in the image. Aphids secrete a sweet liquid waste product called "honeydew," and ants LOVE it! So, they guard the aphids from predators like lady beetles.