Saw several from 12" to about 7'. None seemed at all concerned by the many people walking past.
Growing in a pond
image from a scanned slide
Observed at Brazos Bend State Park. They had bright red bills, mostly brown feathers with black patches on their thighs and a few white wing tips. One had a black stripe running down its head and neck.
Found on elm lake trail at Brazos Bend State Park
Found in forty acre lake picnic area at Brazos Bend State Park
On tree in elm lake, spotted at night during American alligator survey.