noun
- The region of a bird's body between the vent and the tail, including the feathers covering that area.
Usage: ornithology; plural: crissae
Examples
- The crissa of the warbler displayed distinctive white markings.
- Ornithologists examined the crissa to identify the bird species.
- The crissa feathers were ruffled as the bird preened.
- Field guides often highlight the crissa as a key identification feature.