. a surgically-insertable "FitBit", originally meant for humans, was retooled & converted for livestock - dubbed the EmbedIVet, it tracks: * core temp * pulse * cud-chewing * general activity * bloodborne O2 [O2 saturation] * sudden movement, via an accelerometer Subcutaneous Fitbits? These cows are modeling the tracking technology of the future It's installed just under the skin, with a local anaesthetic - the size is described as "the round area is a bit bigger than a quarter", but if the scale of the photo, showing a Holstein sporting one along her left jaw, is even close to reality, that central disc is a little larger than a HALF-DOLLAR, not a 'quarter'. The coin-type battery is expected to last about 3-years. FYI, a cow's eye is about the same diameter as a 1-dollar U-S coin. - terry .