It's lucky these hatchlings are sleepy and small enough to keep an eye on for a few weeks. Once large enough, yale hatchlings have to be placed in pens with other yales, otherwise they get into too much trouble. When awake, these hatchlings try to eat everything in sight, and run around looking for ways to escape. If a yale hatchling does manage to escape, it's probably a good idea to go looking for it. Otherwise, some magi will likely visit you, complaining about their items that have been eaten by the naughty hatchling.
Yales are known to get into everything, and are typically kept out of the castle for this reason. A series of gates have been erected around their fields, as yales can get out of almost any enclosure. Young yales in particular like to try and climb fences, or squeeze through them. The fact that these companions have excellent balance and can even climb some trees helps them escape. If a yale finds a vulnerable area, it will bound off and let the others know. Then a whole herd of goats will batter at the weak spot until they break out, then run rampant around the castle, causing trouble. To try and distract the yales, interesting items are donated to them. These objects are usually broken or eaten, but it's important to keep giving the yales toys, lest they become bored. It's inevitable that these companions aren't entertained for long, though. They break out once every few moons, and it is always a cause of woe for students. This is because yales will eat practically anything, be it a scroll or someone's lunch. It doesn't seem to matter how carefully constructed their fences are yales will plan together and plot for months, and they quite seem to enjoy the challenge. Although they may seem dumb, munching on grass and scratching their backsides on trees, yales are actually quite intelligent. Many think yales only act simple, to hide their true natures and make outsmarting humans easier.
Sprite art: Cassowary/GlassWalker | Description: Damien