ELI5 Easter - why the bunny and chocolate eggs?

How is the date for Easter determined each year? Why do we have an Easter bunny and chocolate Easter eggs? Why did Christmas become a bigger holiday than Easter? What animal is often used instead of a bunny in Australia?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: nehala, nomocactusnames, vorengard, marcvanh, euthy, deadmanv5, juanpablo2016, override9636, underbuster and kouhoutek.

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