Why does the thrush toil secretly in the thrush's nest?

Is a bird eating a worm an example of parasitism? Why is bird nest fern a fungi? Spheniscus mendiculus is the only penguin north of the equator and it's named for where it lives What is it? Do the feathers of a pigeon weigh less than the bones of a pigeon? If you put 1 female and 1 male budgie together will thay hurt each other? Is a swan a natural enemy of geese? Bryan breeding like girls who are girly? Who are the relatives of the king penguin? When was Swainson's Sparrow created? Does budgies have years like human people? What is the conflict of Jonathan livingston seagull? Where do cranes make their nests? What is perching birds? The smallest bat? In what ecosystem does the arctic tern live in? How much do you grow in inches if you have limb lengthening surgery? What are bees eating in oak trees? Which of the adaptations would be useful for encouraging visitation by hummingbirds? What is an unkindness? Can pigeons eat crackers?