Nothura boraquira;
White-bellied Nothura;
Codorna-do-Nordeste.

N. boraquira and N. maculosa look similar, and both occur in Ceará. I have identified this bird as N. boraquira because of the yellow legs and the whitish/creamy belly (see Mata et al. 2006).
White-bellied Nothura (Nothura boraquira)
10/09/2005; Fazenda Canaã, Pentecoste, Ceará, Brazil. 200 mm f2.8 lens.