One of the worst things ever is seeing an animal in pain.
That's why it's always so heartwarming to see people helping them. Take, for example, the following video. In it is a young kitten with a rather large insect lodged firmly up its nose.
The insect is a Cuterebra larva, which might have eventually killed the poor creature if not for the quick intervention of the Nebraska Humane Society.
WARNING. This video is kind of graphic, but it will give you some warm, fuzzy feelings in the end!
(source: Nebraska Humane Society)
Yuck. These parasites love to infest small mammals that spend time outdoors, such as dogs, cats, rabbits, ferrets, squirrels, and other rodents. If you have a pet that you let outside, make sure to check regularly for these buggers.