White-breasted nuthatches and Downy woodpeckers both eat insects that hide in the furrows of bark in hardwood trees. The Downy woodpecker searches for insects by hunting from the bottom of the tree trunk to the top, whereas the white-breasted nuthatch searches from the top of the trunk down. These hunting behaviors best illustrate which of the following ecological concepts?
A) competitive exclusion
B) resource partitioning
C) character displacement
D) keystone species
E) bottom-up and top-down hypotheses
Tri parti-colored (white, brown and black) guinea pig in its natural habitat.
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
Case of ONJ that occurred spontaneously. Note the white area, which is exposed necrotic bone.