I visited the Ozark Natural Science Center this morning, with Alyssa DeRubeis and Mitchell Pruitt.
Many warbler species are back on territory, with multiple individuals singing.
A pair of Louisiana Waterthrushes demonstrated their unhappiness with my presence by flying around me in loose circles while vocalizing persistently. I was probably very close to their nest.
2 male Kentucky Warblers were engaged in a territorial dispute. One bird was initially perched in a tree (around 10 feet up) and dive-bombed the other bird on the ground (presumably the "owner" of the territory). This was followed by a high-speed chase through the undergrowth with both birds making a series of rapid "chip" calls.