In several species of "Corydoras", it has been observed that the fishes, after initial evasive reaction to threat, lie still; this is suggested to be a form of cryptic behavior. However, it is also argued that most species do not have cryptic coloration nor freezing behavior and continue to exist, likely due to their armor and venom. A few species of "Otocinclus": ("O. affinis", "O. flexilis", "O. mimulus" and "O. xakriaba") are considered to be Batesian mimics of certain "Corydoras" species ("C. diphyes", "C. garbei", "C. nattereri" and "C. paleatus", respectively). These species have bony plates of armor and strong, frequently venomous spines as defenses, making them less palatable; by mimicking these species in size and coloration, "Otocinclus" avoid predation.