Calcarius ornatus (Chestnut Collared Longspur) is a species of birds in the family calcariid buntings. It is listed as near threatened by IUCN and as endangered by COSEWIC. It is found in the Nearctic and the Neotropics. Individuals can grow to 23 g. Reproduction is dioecious. Chestnut Collared Longspur relies on flight to move around.
EOL:llä on tietoa 17 määritteelle, mukaan lukien: