sentences:  Further specialization within a habitat is associated with behaviors and morphological adaptations (physical traits of size and shape).Tiny birds are lightweight enough to hang onto the ends of twigs and pluck small prey; the goldcrest of Europe and its counterpart the golden-crowned kinglet of North America exhibit this feeding style.The related common firecrest is very similar in size and shape, but slightly bulkier, and has less of a tendency to glean along twigs and more of a habit of flying from perch to perch.