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Barnacles and Whales - Barnacles get free transportation, whales unaffected

Fleas and Dogs - Fleas get blood meal, dogs suffer irritation

Remoras and Sharks - Remoras get free rides, sharks unaffected

Oxpeckers and Zebras - Oxpeckers eat ticks, zebras get pest control

Tapeworms and Humans - Tapeworms absorb nutrients, humans can suffer malnutrition

Clownfish and Anemones - Clownfish get protection, anemones get cleaning

Cleaner Fish and Groupers - Cleaner fish eat parasites, groupers get cleaned

Epiphytic plants and Trees - Epiphytes get support, trees unaffected

Mosquitoes and Humans - Mosquitoes take blood, humans can get diseases

Acacia Ants and Acacia Trees - Ants get food and habitat, trees get protection from herbivores

Mites and Beetles - Mites attach to beetles for transport, beetles unaffected

Vampire Bats and Host Animals - Bats consume host blood, host animals can suffer blood loss and infections

Pistol Shrimp and Goby Fish - Shrimp digs burrows, goby provides lookout

Shark-sucking fish and Sharks - Fish get transportation and food scraps, sharks unaffected

Sea Lice and Salmon - Sea lice feed on mucus, blood, and skin, salmon can get weakened or die

Yucca Moths and Yucca Plants - Moths pollinate yucca plants, moths lay eggs in flowers

Army Ants and Antbirds - Antbirds feed on insects disturbed by ants, ants unaffected

Bees and Flowers - Bees get nectar, flowers get pollinated

Hyenas and Lions - Hyenas scavenge remains of lion kills, lions typically unaffected

Nitrogen-fixing Bacteria and Legumes - Bacteria convert $N_2$ to ammonia, legumes get nitrogen in usable form

Brood parasites like the Cuckoo and Warblers - Cuckoos lay eggs in warbler nests, warblers raise cuckoo chicks to the detriment of their own

Lice and Humans - Lice feed on human blood, humans can get itching and irritation

Mycorrhizae and Plants - Mycorrhizae expand root surface, plants improve nutrient uptake

Gobies and Pistol Shrimp - Gobies watch for danger, shrimp provide shared burrow

Cattle Egrets and Cattle - Egrets eat insects flushed by cattle, cattle unaffected

Giant Kidney Worm and Mammals - Worms infect the kidney, mammals suffer organ damage

Man-of-War Fish and Portuguese Man o' War - Fish immune to nematocysts, gets protection, Man o' War unaffected

Candiru Fish and Host Fish - Candiru feeds on blood and tissue, host fish harmed

Pseudoscorpions and Larger Insects - Pseudoscorpions hitch rides for dispersal, larger insects unafflicted

Spider Crabs and Sea Anemones - Crabs get camouflage, anemones get nothing

Ticks and Deer - Ticks consume blood, deer may get Lyme disease

Ants and Aphids - Ants protect aphids, aphids provide honeydew

Silverfish and Army Ants - Silverfish eat crumbs and debris in ant trails, ants unaffected

Gut Microbes and Humans - Microbes help digest food, humans provide habitat and nutrition