both species benefit from interaction
common example of mutualism is the interrelationship between flower and
common example is payment of fruit for seed dispersal
both species (or individuals) lose from interaction
a scarce resource (food, shelter, mates, etc.) is shared, often competition
is the result
the predator gains by killing and eating the prey (who loses)
a gila monster eats a mouse
example is this crab spider eating this butterfly.
the parasite gains by feeding on the host (loses)
mistletoe takes water and nutrients from this desert ironwood.
praying mantis egg case has been parasitized by a wasp whose larvae fed
on the mantids and then chewed their way out of the egg case.
the commensal gains while the host is unaffected
gopher snake uses an abandoned rodent hole.