Definition of ophthalmology for English Language Learners. medical : the study of the structure, functions, and diseases of the eye.
Pullet: Six Weeks to One Year. Young female chickens less than 1 year old that have fully feathered out and are about the size of large pigeons are called pullets. Expect your barred rock pullet to start laying eggs when she is about 16 to 20 weeks old. Once she begins laying, she should produce one egg every 25 hours â except during the cold, dark hours of winter when she may not lay at all -- until her first molt a year later.
Female monarch butterflies lay an average of about 700 eggs over two to five weeks of egg laying, with a record in captivity of 1179! Each egg is formed inside the female prior to fertilization, including the hard outer shell, called the chorion, which protects the developing larva inside.