Birds are born inside hard-shelled eggs. For many days to weeks they are protected and kept warm by their parent(s). This is called incubation. After they hatch, they will be fed by their parent(s). When they develop flight feathers they will learn to fly. Soon after flying they will be on their own. Next year they will mate and have young of their own. The cycle begins again.
When you research information you must cite the reference. Citing for websites is different from citing from books, magazines and periodicals. The style of citing shown here is from the MLA Style Citations (Modern Language Association).
When citing a WEBSITE the general format is as follows.
Author Last Name, First Name(s). "Title: Subtitle of Part of Web Page, if appropriate." Title: Subtitle: Section of Page if appropriate. Sponsoring/Publishing Agency, If Given. Additional significant descriptive information. Date of Electronic Publication or other Date, such as Last Updated. Day Month Year of access < URL >.
Amsel, Sheri. "Bird Life Cycle (Eastern Bluebird)" Exploring Nature Educational Resource ©2005-2019. September 20, 2019
< http://www.exploringnature.org/db/view/Bird-Life-Cycle-Eastern-Bluebird >