is not thought to be an accidental; the pitchers of this species appear to be the nematode's natural habitat. The microecosystems in these pitchers were found to be dominated by mosquito larvae, midges, and B. mirabilis. It is speculated that this nematode might have a phoretic relationship with one or more infaunal insect species. In southern China, tree frogs have been observed in the pitchers of N. mirabilis. The amphibians do not fall prey to the plant, but rather feed on insects that are caught by the pitchers. They are not affected by the acidic digestive juices (which may have a pH as low as 2), likely due to the mucilaginous outer layer of their skin. The first record of an aquatic fungus living in the pitcher organ of a carnivorous plant came from a specimen of N. mirabilis growing along the Jardine River in Australia. The mycelial fungus was observerd as both free-living in the trap's fluid and attached to chitinous insect remains. The pitchers of N. mirabilis have also been found to harbour a complex community of bacteria. These bacterial communities appear to be more diverse than those found in the pitcher fluid of N. ampullaria and sympatric N. gracilis in Peninsular Malaysia. In N. mirabilis their composition can also differ significantly according to pitcher type, something not seen in the other two species. Natural hybrids Nepenthes mirabilis has the greatest number of known natural hybrids of any species in the genus. ? (N. alata × N. merrilliana) × N. mirabilis [=N. × tsangoya] N. alata × N. mirabilis [=N. × mirabilata] N. ampullaria × N. mirabilis [=N. × kuchingensis, Nepenthes cutinensis] ? (N. ampullaria × N. rafflesiana) × N. mirabilis [=N. × hookeriana × N. mirabilis] N. andamana × N. mirabilis (including N. andamana × N. mirabilis var. globosa) N. benstonei × N. mirabilis N. bicalcarata × N. mirabilis (including N. bicalcarata × N. mirabilis var. echinostoma) ? (N. bicalcarata × N. rafflesiana) × N. mirabilis var. echinostoma N. gracilis × N. mirabilis [=N. × sharifah-hapsahii, N. × ghazallyana, N. × grabilis, N. neglecta?] N. insignis × N. mirabilis N. kampotiana × N. mirabilis N. kongkandana × N. mirabilis N. merrilliana × N. mirabilis N. mirabilis × N. northiana N. mirabilis × N. rafflesiana (including N. mirabilis var. echinostoma × N. rafflesiana) N. mirabilis × N. reinwardtiana N. mirabilis × N. rowaniae N. mirabilis × N. smilesii