Assertion: kingfisher | /r/CapableOf | switch
Facets:
Source sentences:
text: The eyes of many birds have two foveae (the fovea is the area of the retina the greatest density of light receptors), and a kingfisher is able to switch from the main central fovea to the auxiliary fovea when it enters water; a retinal streak of high receptor density which connects the two foveae allows the image to swing temporally as the bird drops onto the prey.
text: Kingfishers are able to switch from the main central fovea to the auxiliary fovea as they enter the water, so when the egg-shaped lens of the eye points towards it they can maintain visual acuity, or sharpness of vision.