Final answer:
The largest order of birds that perch on objects, which includes many songbirds and represents a significant portion of bird diversity, is called the Passeriformes.
Step-by-step explanation:
The largest order grouping of birds that perch on objects, known for their grasping feet with four toes, many of which are songbirds, is called the Passeriformes. This order also referred to as perching birds, includes a diverse array of species such as tanagers, sparrows, and finches. With more species than all other bird orders combined, Passeriformes represent the largest single order of land vertebrates and offer an impressive diversity of birds.