On the species with an example.

The Shaykh : Likewise, regarding the species, if a person sacrificed a horse, and a horse may be more expensive than a camel, does that suffice as a sacrifice? A man sacrificed a horse, and a horse may be more expensive than a camel, is it valid to be a sacrifice?
The student: No.

The Shaykh : Why? Because it is not of the species from which sacrifices are made, and the Shari'ah has only prescribed the sacrifice with the domesticated animals of livestock: camels, cattle, and sheep.