There are certain species in the cobra family that can spit; some can't. Red, Indonesian, Mozambique, Ashe's, etc., all have forward facing holes at the tip of the fang that allows for "spitting". They don't actually spit, but the venom glands get contracted and the venom rushes through the fangs and then forced out through that hole at the front of the fang by a gust of air expelled from the lungs.