Relationship, Choice, Health, and Typologies of Unpaid Care Labor for Older Adults.

Providing unpaid care labor to older adult friends and relatives is associated with deleterious health outcomes, especially among persons who feel they have no choice when taking on care responsibilities. We used hierarchical cluster analysis and structural equation modeling of data from the National Alliance for Caregiving's Caregiving in the U.S.

Acoustic profiling in a complexly social species, the American crow: caws encode information on caller sex, identity, and behavioural context.

Previous research on inter-individual variation in the calls of corvids has largely been restricted to single call types, such as alarm or contact calls, and has rarely considered the effects of age on call structure. This study explores structural variation in a contextually diverse set of "caw" calls of the American crow (), including alarm, foraging recruitment and territorial calls, and searches for structural features that may be associated with behavioural context and caller sex, age, and identity. Automated pitch detection algorithms are used to generate 23 pitch-related and spectral parameters for a collection of caws from 18 wild, marked crows.