I’m a mobile player so I find them most around the shores on the right lowers side of the map. I found my basilo sausage around there just be aware of the amount of animals that will come after your basilo after taming it I recommend taking it to a shore where nothing can touch it.I took my to a shore and luckily they can go on pretty shallow waters so the megalodon‘s backed up and then I went back to my base and then requested the basilo.