Ubwonko bw’inyamaswa zikururuka (reptiles) buzibashisha kumenyera vuba aho zigeze n’ibihe zirimo (ni yo mpamvu muzasanga izo nyamaswa zihindagurika mu bushyuhe bw’umubiri bitewe n’uko aho ziri hashyushye cyangwa hakonje), ubw’inyamswa bita inyamabere bukazibashisha kwiyoroshya, ntizigire amahane, ariko ubwonko bw’umuntu ni bwo bwonyine bushoboye guhimba ibishya no gukundana nyakuri.