Figure 1. The Rufescent Tiger-Heron is not uncommon, but shy. When a human approaches, he is often the first bird to fly away. See figure below for details of head and neck plumage.

Figure 2. Detailed view of head and neck (figure 1 enlarged). The neck of this individual is rufous, or rufous chestnut, barred with some lighter color, which varies in tone (buff or creamy). This is not the adult plumage described in the literature. ("...neck and breast rufous chestnut", according to Mata et al. 2006, similar in Hilty and Brown 1986, Hilty 2003, or "...neck ... rufous chestnut, with narrow black barring", according to Blake 1977, similar in Restall et al. 2006 Vol I, II.) It is also not the typical juvenile plumage (see same references). It appears that the Rufescent Tiger-Heron needs a few years (2 years according to Sick 1997, at least 4 years according to Ridgely and Greenfield 2001) to reach the adult plumage stage. Maybe this is a late subadult plumage? Anyway, in the literature I consulted, I did not find a description of the plumage we see here.