If you mean in their bedding, where they lie down, etc., then you're probably seeing flea larvae (especially as you've mentioned dried blood). You may not see any adult fleas on your cats, as the main bulk of the flea population is in the environment rather than on the animal. Make sure you vacuum their beds, carpet. etc. on a regular basis and use one of the cat spot-on flea treatments from your vet (Frontline, or similar). They should also be on a regular intestinal wormer.
If you're really worried, you can scoop some of these things up in a container and take them to your vet. He/she should be able to identify them for you fairly easily.
Actually, flea larvae can appear black if they've been feeding.
This is called feline worms. They can be very dangerous to cats, especially kittens and needs to be check out by a vet as soon as you notice.
millipede
NOT at all
small worms and small slugs
Some worms can bite.
Worms eat cats that are decomposed and they take small bites of it.
they have worms
Silk worms
White worms in cats and dogs are probably tapeworm, which is spread by fleas.
This is called feline worms. They can be very dangerous to cats, especially kittens and needs to be check out by a vet as soon as you notice.
cats do not get worms if they are properly fed and healthy, if they do contract some sort of disease that causes worms they need to be taken to a vet immediately.
Crabs, shrimps, worms, clams, and small fishes
No there not black all tape worms are WHITE
millipede
NOT at all
Yes
No. worms, bacteria are decomposers