drawing next to a baptism entry

Hi
I saw this drawing of an animal head (bird?) next to a baptism entry. If someone has time, could you take a look and post what you think it is? Has anyone else seen anything like this? Anyone know what it could mean? My curiosity was piqued...

Michoacan, Sagrario, 7 Dec 1603, image 84,
Andres son of Pedro Garcia Maldonado and Maria (?)

https://familysearch.org/pal:/MM9.3.1/TH-1-18744-23591-19?cc=1883388&wc=M99L-TGF:2124324060

Regards
Denise