chauna torquata การใช้

• The screamers are represented by three species, the horned screamer ( " Anhima cornuta " ), the southern screamer or crested screamer ( " Chauna torquata " ) and the northern screamer or black-necked screamer ( " Chauna chavaria " ).
• In the black-necked screamer ( " Chauna chavaria " ) the spikes are oval in cross-section, but in the southern screamer ( " Chauna torquata " ) there is a sharp-edged keel along the spike s proximal edge, and in the horned screamer ( " Anhima cornuta " ) the spikes are triangular in cross-section with three sharp keels.