Princeton's WordNet(3.00 / 1 vote)Rate this definition: 1  opacity(noun) the phenomenon of not permitting the passage of electromagnetic radiation. 2  opacity, opaqueness(noun) incomprehensibility resulting from obscurity of meaning.
The Oystercatcher is a species of bird that lives around Europe and Asia. They usually eat shellfishes that are found on beaches and mud.The Eurasian Oystercatcher uses its sharp bill to open the shells of oysters and mussels.It cuts the muscle between the two halves of the shell together, or it crashes the shell against a rock and eats the oyster inside.ith bills like that, oystercatchers are dangerous opponents for other birds. They can fight off predators, and often raid other birds to steal their catches. They attack other birds at an average of five-minute intervals during low tide. They get as much as 60% of their food by theft.
An owl butterfly is a butterfly, in the genus Caligo, known for their huge eyespots, which resemble owls' eyes.They are found in the rainforests and secondary forests of Mexico, Central, and South America.esearch of Stevens et al. (2008), however, suggests that eye-spots are not a form of mimicry and do not deter predators because they look like eyes. Rather the conspicuous contrast in the patterns on the wings deter predators.