Since it's all about the sacrifice made by Abraham, Muslim people in different parts of the world also offer an animal sacrifice which literally done by people under the Mosaic Law.
Canonically, sheep is the closest thing that they can give since it's an example in most of the scriptural account which was set early on.
Nonetheless, today, there are different animals that they can sacrifice like lamb and goat in order to reciprocate the sacrifice for Ibrahim.
The meat of these animals will be shared together by members of the family, within the community, and even those tourists who are curious about this tradition are welcome to join the feast by eating this meat of sacrifice.
This is the same reason why lambs and other similar animals that can be offered that day are sold in hefty amount, and it's really in demand in the market since it's a universal celebration to all Muslims.