Colombia is extremely difficult. When I worked at the American Museum of Natural History we wanted to do an expedition to Colombia to collect arachnids. It took over a year of paperwork and 50% of the material had to remain in Colombia. No live arachnids were allowed. Also, my wife has a grad student from Colombia and I have been asking her about getting frogs. She said she even has difficulty getting permits for insects, so it really isn't worth it.