The most reliable way is using a mod like Spawn Egg Preview. It automatically renders the 3D entity in the GUI instead of the standard colored egg.
Enable the pack in the menu in-game. 3. Verification XK's Decoration - Minecraft Mods - CurseForge
This feature is often implemented through resource packs or specific mods like Spawn Egg Preview to help players identify mobs more easily than by comparing similar-colored egg textures. Guide to Enabling 3D Spawn Egg Displays To achieve this effect in your game, follow these steps: 1. Choose Your Method