Bring them back to the Mews lab for DNA testing.
It's not the chicken eggs, it's the egg shells from New Jersey. When run through the DNA testing, the egg shells from the nest in New Jersey prove the existence of the Jersey Devil.
Take the shells back to the Mews lab and test them. The DNA analyzer will prove the existence of the Jersey Devil.
go to mew's mansion to continue your journey.
you get over the birds in the egg shells
There are only 2 items you check with the DNA analyzer: the fur from Puerto Rico and the egg shells from New Jersey. If you follow the test process carefully (and press the devleop button on the developer), Mews will tell you the results.
You place one of the samples (fur or egg shells) in a vial and follow the instructions on the right side of the screen. When the x-ray grid is in the developer, push the flashing button.
You need a photo of Nessie at Loch Ness, a tooth from the Chupacabra from Puerto Rico, and egg shells from the nest of the Jersey Devil in New Jersey. (see related solution)
In a nest at the top of the tree at the old house in New Jersey. You need the grappling hook from the attic to reach it.
During the DNA testing on Cryptids Island, you will add the sample (fur or egg shells) to a beaker, then before add an enzyme (the red #3). Before putting this mixture into the tray, you add Lab Gel, which is yellow in color, to the tray. When you add the orange sample beaker, the tray also turns orange.
Show them to Mews then follow the instructions on the DNA test. After the x-ray tray is in the developer, press the flashing button to get the result.
You need a photo of the actual Nessie, a tooth from the chupacabra, and egg shells from the Jersey Devil. (see the related questions below)