fish:	0	(shark)
fish:	1	(trout)
fish:	2	(carp)
mammals:	0	(bear)
mammals:	1	(goat)
mammals:	2	(leopard)
birds:	0	(eagle)
birds:	1	(robin)
birds:	2	(crow)
creatures:	fish	(Array)
creatures:	mammal	(Array)
creatures:	bird	(Array)