The Jersey Devil can be found near an old deserted house (address 666) in the forest at New Jersey. In order to get to the house, you will need
Open the locked dumpster with the bolt cutters, and take the junk door into the restroom. Matching it to the other door gives you driving directions through the woods. Before you leave on the motorcycle, USE the matches and the lantern will be lit. Follow the directions (or just steer right left, right left, right left) and you will reach a dead end in the forest. Use the "look around" to get off the bike and enter the gate. Inside the house, go to the second floor and push the dresser left to reach the attic. The noise is just a raccoon, but get the grappling hook and go back downstairs. You will encounter the Jersey Devil!
Go outside and climb the tree with the grappling hook. Take some egg shells back to the Mews lab, and do the DNA test to confirm the existence of the Jersey Devil.
hop on the helicoper in front of Mew's mansion
You have to look for Bigfoot/Yeti in the Himalayas, the Jersey Devil in New Jersey, the Loch Ness Monster in the Loch Ness in Scotland and the Chupacabra in Puerto Rico.
There are 3 you have to prove: Nessie (Loch Ness) Chupacabra (Puerto Rico) New Jersey Devil (New Jersey) You can't get what you need to prove the Yeti, so you are sent to find Bigfoot.
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)
On Cryptids, you go to the Himalayas and ask for the Yeti skull. He will not give you it, but you will be handed a lantern to 'light your way' as he claims.
there is a look around button in the bottom left hand corner xoxo
There are 5 cryptids in the museum, including the Giant Squid, which is already confirmed. The others are: Nessie - Loch Ness monster Yeti - Abominable Snowman of the Himalayas Chupacabra - the Goat Sucker (Puerto Rico) Jersey Devil - flying horse-faced creature of New Jersey You will not prove the Yeti, because all you get is a footprint photo. But you will later go after the similar creature of North America, called Bigfoot.
You don't go to New York. You do, however, go to New Jersey in the helicopter. (see related question)
The forest is in New Jersey. You will need the lantern from the Himalayas, the matches from the pub at Loch Ness, and the bolt cutters from Puerto Rico before you can proceed at New Jersey.
In the deserted house in New Jersey, you have to slide the dresser to the left on the second floor, so that you can jump to the attic.
You need the lantern from the Himalayas, and the matches from Loch Ness, so that you can travel in the dark forest at New Jersey.
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.