Learn how to identify bird eggs by color and size. One of the most interesting bird egg facts that despite the broad variety ...

2010). These and other cuckoo hosts appear to have evolved a simple rule of thumb to direct their behavior: "eject the egg unlike your own". But how does a bird know what its own eggs look like?

Brood parasitic birds lay their eggs in the nests of others ... and require slightly shorter incubation times (causing a size advantage for parasitic nestlings) (Davies 2000) (Figure 1).