The pelican was thought to feed her young with her own blood, as shown in the copperplate below.(I've seen many such images, and none of the artists seem to have any notion of what a real pelican looks like, though the idea that a pelican feeds its young by opening her breast to her chicks seems to be derived from observation of actual pelicans, as seen below.)
"The Pelican in her Piety"
by
Pieter van der Borcht (1545-1608)Source: Cryptomundo
Source: Florida-Georgia Camping,
Kayaking and Exploring