Hinge Hinge A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation: all other translations or rotations being prevented, and thus a hinge has one degree of freedom. Hinges may be made of flexible material or of moving components. In biology, many joints function as hinges like the elbow joint. There are many types of door hinges. The main types include: Other types include: Since at least medieval times there have been
Gliding tree frog Gliding tree frog The gliding tree frog ("Agalychnis spurrelli") is a species of frog in family Hylidae. It is found in Colombia, Costa Rica, Ecuador, and Panama. Other common names are the gliding leaf frog and Spurrell's leaf frog. Its natural habitats are subtropical or tropical moist lowland forests and intermittent freshwater marshes. It is threatened by habitat loss. The gliding tree frog grows to a snout to vent length of for males and for females. The head is broad and the eyes are large, with reticulated lower eyelids. The body is slim with smooth skin on the dorsal surface