During my childhood days I used to see my dog stretching after waking up. It is only after many years I learnt that animals and birds stretch after waking up. Don't see many people doing that.
This shot of tiger stretching is from Bandhavgarh from my archives.
ISO 200, 560mm (Canon EOS 400mm f2.8 L IS USM lens plus 1.4x TC), f5.6, 1/800, tripod.
Which other animals have you seen stretching after they have woken up?