“…Drag harnesses (Cornick et al, 2006), collars (Lang and Daybell, 1963), pipes (Aoki et al, 2011;Suzuki et al, 2014), wooden blocks (Boyd et al, 1997) have been attached to marine mammals while measuring their long-term energy consumption with radio-isotope labeled water (Costa and Gentry, 1986), heat flux (Willis et al, 2005) their diving and swimming behaviors (Boyd et al, 1997;Aoki et al, 2011), or their colony return rates (Costa and Gentry, 1986;Boyd et al, 1997).…”