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Here's the text that appears in the center of the image. Read at your own peril!
This horyble monster is cast of a sowe in Eestlande in Pruse two myle from Runyngbergh in a vyllage which is called lebe[n]hayn whiche monster hathe had a great wyde mouth, with two eyen, foure eares, no stomacke nor guttes [and] two hertes, viii. fete, and the body was growe[n] togyther from the nauyll vp to the hede, [and] with thys foresayde monster were broughte forth. v. yonge pygges alyue, and these two fygures be cou[n]terfeyted after the facyon of the sayd monster both before and behynde. The yere of our lorde. 1531 [Germany]
Those Germans know how to have a monstrous birth! Although I'm a bit disappointed that no rationale for the monster's existence is provided, I think my approximation is pretty close to what really caused the 2-in-1 piglet. Who wants bacon?