“Chameleons can change the direction of the blood so that it can flow backwards; this is called the renal portal system and is one of the ways that chameleons can survive if they are short of oxygen or if they become dehydrated”…
https://crossriggsvets.co.uk/wp-con...factsheets-types=cmVwdGlsZQ==&nodeguid=158662
https://crossriggsvets.co.uk/wp-con...factsheets-types=cmVwdGlsZQ==&nodeguid=158662