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Elephant and lion recordings: public domain. Owl by Shyamal, CC BY-SA 4.0. Parrot by Mpadros, CC BY-SA 3.0. Bee by Free Sounds Library, CC BY 3.0. Gorilla grunt sound effect by AntumDeluge, CC0; converted and leveled for this gallery. Blue whale from NOAA and orca from the U.S. National Park Service, public domain. Bird recording sources and their creator/license details: Eagle Hummingbird Peacock Duck Goose Woodpecker Cardinal. Bug recording sources and their creator/license details: Bumblebee Grasshopper Cricket Cicada. Object recording sources and their creator/license details: Clock Drum Oven Watch Xylophone. Transportation recording sources and their creator/license details (Fire Truck, Ambulance, and Police Car are locally synthesized U.S. style examples): Airplane Helicopter Car Train Ship Tractor (Work With Sounds / Museum of Municipal Engineering, CC BY 4.0). Nature recording sources and their creator/license details: River (Stephan, public domain) Waterfall (Benzband, CC BY-SA 3.0) Ocean and Beach (Michael Schoenitzer, CC BY 3.0) Rain (ジダネ, public domain). Past and present animal recording sources and their creator/license details: Dog Cat Horse Cow Pig Sheep Goat Donkey Guinea Pig Chicken Rooster Turkey Bison. Additional recordings and their creator/license details: Zebra Tiger Bear Fox Wolf Monkey Cheetah Deer Squirrel alarm call by Parande, CC BY-SA 3.0; excerpted, filtered, and leveled..