The Director of Output at the Institute held the hypothesis that some kitties have tongues so long they tend to peek out now and then. To test the hypothesis, the directors recorded for a week which of the six study subjects at the Institute might have an excessively long tongue.
Result: Three out of six study subjects displayed a tongue that slipped out which indicated that the tongue was too long for the mouth to contain at all times. This is scientific proof that 50% of all kitty cats have tongues too long for their mouths. The hypothesis is now a theory and is documented in the following photos.