ShareMondays2020 – Open Wide!
My fascination with the pelicans in St James’s Park continues! I managed a short visit on Friday afternoon after an appointment at Guy’s Hospital. It’s so therapeutic after you’ve just had to hear more bad news. I was expecting it really, no big shocks but disappointing all the same. So from having to keep my own mouth wide open for the dental conservative consultant, I went to see a much more impressive wide mouth!
The bare skin on the lower mandible of the pelican is known as the gular pouch. There are other birds with gular skin but the pelican has the largest. The lower mandible expands to open the pouch allowing it to scoop it’s prey from the water. As the mandible contracts, water is expelled from the bill and the bird can then tilt its head to let the fish slide down the gullet. The gular pouch actually has a larger capacity than the pelicans stomach! You may have heard the rhyme by Dixon Merritt: “Oh, what a wondrous bird is the pelican! His bill holds more than his belican. He can take in his beak enough food for a week. But I’m darned if I know how the helican.” In fact, any surplass food is actually stored in the oesophagus!