Today when I went to get my cockatiel out of the cage there was something brown and sticky on his vent (we say "he" but dont actually know the gender). I'm not sure if this is droppings or if it could be something else, like blood? Has anyone seen this before or know what it could be? It got on my hand and it felt like there was more. He's relatively new to us so he doesn't trust me to let me check him out.