Answer:
Common Types of Context Clues
Root word and affix: People who study birds are experts in ornithology.
Contrast: Unlike mammals, birds incubate their eggs outside their bodies.
Logic: Birds are always on the lookout for predators that might harm their young.
Definition: Frugivorous birds prefer eating fruit to any other kind of food.
Example or illustration: Some birds like to build their nests in inconspicuous spots — high up in the tops of trees, well hidden by leaves.
Grammar: Many birds migrate twice each year.