Nesting observations in the marshes of Clay and Palo Alto Counties for the spring of 1947 are reported. Spp. included are: pied-billed grebe* (Podilymbus podiceps podiceps), black-crowned night heron (Nycticorax n. hoactli), American bittern (Botaurus lentiginosus), eastern least bittern (Ixobrychus e. exilis), marsh hawk (Circus hud-sonicus), Virginia rail (Rallus l. limicola), Florida gallinule* (Gallinula chloropus cachinnans), American coot (Fulica a. americana), Foster''s tern* (Sterna fosteri), black tern (Chlidonias nigra surinamensis), prairie marsh-wren (Tel-matodytes palustris dissaeptus), yellow-headed blackbird (Xanthocephalus xanthocephalus), and red-winged blackbird (Agelaius phoeniceus arctolegus). Emphasis is placed on nesting cover and a general discussion ot cover factors is given. Other nesting data pertain to clutch size, laying dates, hatching dates and nest densities.