This birthday theme is a good theme for boys. As for invitations, you can make an invitation out of a passport design; you can have a cover saying “Your passport to jungle surprise”. For the decorations, a lot of bamboo and greens are favorable for this theme. Put on stuffed animals and rubber snakes/reptiles around. Form your finger foods with a bugs-like forms, worms, etc. With games, you can have a safari hunting game or even allow your guests to make their own jungle animals. Bring out your safari favors with binoculars, safari hats, rubber snakes, and compass.
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