I disclose as well. Critters big and small outside, and sometimes they even sneak inside! Geckos jumping out in front of you by the dozens as you walk down the path. Roosters that crow in the morning. Hundreds of chattering birds that get together for Happy Hour every evening at 5:30 in the tree outside. Tree roaches and little tiny ghost ants. Saw 2 6-inch long centipedes once. I even stared into the eyes of a mongoose peering into our living room from the lanai!
I have a paragraph in my house rules disclosing our tropical critter phenomenon, and also indicating that although we will always make an effort to minimize guest contact with such critters indoors, their presence does not constitute grounds for any type of refund.