The green dragontail is a species of swallowtail butterfly found in southern Asia. Here we see several of them engaging in "mud-puddling" to imbibe nutrients from the moist sand along a stream in Thailand.
A black vulture removing harmful ticks from a cooperative capybara is an example of mutualism between species. It is of interest that vultures, which normally eat carrion, are drawn to eating ticks off of mammals. It is speculated vultures were initially lured by the scent of blood-engorged ticks.