Coendou ichillus (a and c) and C. bicolor (b and d) in the same two locations. The species are primarily distinguishable by size differences.

 
 
  Part of: Gregory T, Lunde D, Zamora-Meza HT, Carrasco-Rueda F (2015) Records of Coendou ichillus (Rodentia, Erethizontidae) from the Lower Urubamba Region of Peru. ZooKeys 509: 109-121. https://doi.org/10.3897/zookeys.509.9821