King and Queen of the Pelicans we;
No other Birds so grand we see!
None but we have feet like fins!
With lovely leathery throats and chins!
Ploffskin, Pluffskin, Pelican jee!
We think no Birds so happy as we!
Plumpskin, Ploshkin, Pelican jill!
We think so then, and we thought so still!
Edward Lear, The Pelican Chorus

Given their size and spectacular form, it's no surprise that pelicans have featured in myths and legends. Pliny commented on the bird's capacious beak and belly in his Natural History.
The pelican is similar in appearance to the swan, and it would be thought that there was no difference between them whatever, were it not for the fact that under the throat there is a sort of second crop, as it were. It is in this that the everinsatiate animal stows everything away, so much so, that the capacity of this pouch is quite astonishing. After having finished its search for prey, it discharges bit by bit what it has thus stowed away, and reconveys it by a sort of ruminating process into its real stomach.
As he had an eye for tabloid tales, he would have loved this park-dwelling, pigeon-eating pelican of London. (Not for those of delicate sensibilities.)
Some time between Pliny and the Middle Ages, the pelican underwent a makeover from ravenous diner to motherly martyr. The bird became a symbol of self-sacrifice—when the mother pelican is overcome with remorse at having killed her chicks in anger, she revives them with her own blood. As a symbol, it's lacking some logic. Still, with attention focussed on the noble surrender, no one seems worried about the multiple infanticide.

To his good friends thus wide I’ll ope my arms;
And like the kind life-rendering pelican,
Repast them with my blood.
He got that right.
_______
*I'm not so sure about their apparent jollity