Examples include the Ravager, Hoglin or the horse. They can perfectly fit in the minecart, not the boat though.
Linked issues
Comments
galaxy_2alex
MC-203322
Some mobs that can go in minecarts can't go in boats
Resolved
Duplicate
0
galaxy_2alex
migrated
(Unassigned)
Unconfirmed
(Unassigned)
1.16.3, 1.16.4 Release Candidate 1
Retrieved
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-96212, which has been marked as Works as Intended - this is an intentional game feature. If you have a different opinion, please visit the Feedback website.
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