💩💧🥚

#cloaca #multi-function orifice #excretion #reproduction #urination #defecation #vertebrate anatomy

🦴4️⃣🦵

#vertebrate anatomy #four limbs #tetrapod definition #skeletal structure #animal limbs

👁️○💀

#temporal fenestra #synapsid skull #skull anatomy #vertebrate anatomy #skull opening

🐟🐸🦎🐦🐒+📊

#vertebrate anatomy #species comparison #zoology #anatomical differences #morphology