I'm a first time Guinea-er. I have 6 guinea's aprox. 5 weeks old. All appeared normal the first week. Then I zoomed in on one. It walks normal but drops both wings nearly to the ground. Body shape doesn't resemble the others due to drooping wings. Walks/Runs but beginning to struggle to keep up! Chirps at a higher pitch and constantly stretches neck out and opens mouth as if more air is needed. Today, walks/runs and entire body is fluffed out. Eats and drinks normal. Assume it's toileting as I'm not seeing the actual action. It's becoming a loaner due to not keeping up. Any advice or diagnosis is welcomed.