Foramen of Panizzae is found in the heart of crocodiles and certain lizards. It is present at the point of contact, while crossing each other. The two systemic arches communicate through an opening called foramen of Panizzae.
Rabbit belongs to class-Mammalia of phylum-Vertebrata. The heart is four chambered consisting of 2 auricles and 2 ventricles.
Pigeon (Columba livid) belongs to order-Corinatae or Neognathae of class-Aves. The heart of aves is 4 chambered.
Frog belongs to class-Amphibia, heart is 3 chambered with well developed truncus arteriosus.