International Kissing Day fell on Thursday, and despite originating in the UK, the festival has taken the world by storm – one peck at a time. However, not only humans seem to be marking the occasion. /VCG Photo

Animals show affection and express emotions in a similar fashion to humans – when greeting each other, reconciling after a fight or showing acceptance. /VCG Photo

Some rub noses or touch muzzles together, others pucker up and a few are not too shy to engage in some tongue action in public. /VCG Photo