Nachschlagewerk zu Wajikra 19:19

And how is [a koy] neither like a behemah nor like a hayyah?It is forbidden because of kilayim [to yoke it] with either a behemah or a hayyah. One who deeds his son his behemah and his hayyah he has not [thereby] given him the koy. If one says, “I will become a nazirite if this is [not] a hayyah or a behemah”, he is a nazirite. In all other ways it is like a behemah and a hayyah: It requires slaughtering (shehitah) like them both; It carries carrion impurity; And to it applies the law relating to a limb of a living being like them both.