I'll be in the USA in September. Being a lover of marine mammals, I'm looking forward to visit some of the major aquariums and Sea World of Texas. I hope the walruses at the NY Aquarium will be on display because I think it is the only zoo on my itinerary with this species. I know they were off exhibit earlier this year (saw it on the aquarium's website) but I think they are back on exhibit. How many do they have these days?