The laws of the peace offering are organized into distinct categories based on the type of animal brought to the altar. After detailing the rules for cattle and sheep, a special, standalone section is dedicated to the goat. Even though sheep and goats belong to the same broader family of the flock, the goat is given its own independent focus.
The primary approach among commentators is that this separation teaches a new rule regarding the animal's fat tail. Previously, God commanded that the fat tail of a sheep must be burned on the altar. Because both sheep and goats are classified together as a flock, a person might mistakenly assume that a goat's fat tail must also be offered [אור החיים]. By creating a clear division, the text clarifies that the goat is an exception, and its tail is not offered.
The physical reality behind this distinction is that a goat's tail is quite small and does not qualify as a true fat tail. This is in sharp contrast to the sheep raised in the Land of Israel, which were known for their large, prominent fat tails [אבן עזרא]. While there was no need to explicitly exclude the fat tail when discussing cattle, since cattle are not part of the flock and simply do not have this feature, the goat's status as part of the flock required a specific clarification to prevent any confusion [אור החיים]. Aside from this single difference, the process of bringing the offering is repeated almost exactly, emphasizing that in all other respects, the rules for the goat are identical to those for the sheep.
Regarding the identity of the animal itself, the term used for the goat does not limit the offering to a female, but rather represents the entire species [רמב״ן, אבן עזרא, הטור הארוך, ביאור יש״ר]. In the holy language, animal names are not always strictly divided by gender. Just as the standard words for a camel, donkey, or pig apply equally to both male and female animals, the term for goat serves as a general category. It includes both the male and the female, meaning both are entirely valid to be brought as an offering [רמב״ן, ביאור יש״ר].