What species would you ban from zoos?

I think the point is more so that a potential escape could have very bad consequences on zoo animals.
But any zoo with captive mosquitoes would have wild ones on the grounds, somewhat rendering this problem pointless. I imagine captive mosquitoes would also be much less likely to get an animal sick than a wild one.
 
I am assuming it’s because these highly aerial species are difficult to keep in captivity.
Zoos almost never keep those anyway, for your information.
 
I am assuming it’s because these highly aerial species are difficult to keep in captivity.
Zoos almost never keep those anyway, for your information.
You assume correctly. I have seen swallows kept in an aviary, some years ago. Thank you for the information; I have only been interested in, and connected with zoos for some 65+ years, and still have a lot to learn
 
I have seen captive House Martins and Barn Swallows at Wuppertal, and the latter at Plzen.
 
Monterey Bay Aquarium keeps two Laysan Albatross rescues, and a few seabird rescue places have frigatebirds. I know a handful of petrel species have been kept at various places in the past but I'm not currently aware of any.
 
I do not think an outright ban is necessary for these birds. From a European point of view, collecting them from the wild is already mostly illegal, and given that tube-noses, swifts, frigatebirds and swallows* have hardly any meaningful population in zoos at the moment, I think that the current legislation is more than sufficient. A ban would only make it harder for zoos to (temporarily) take care of rescued individuals.

* The one exception in Europe in can think of is Barn Swallow, which is kept and bred with reasonable success in a handful of zoos. I have only seen the aviary at Rotterdam (they were signed in the Okapi aviary, but I have never seen them), which provides reasonable space for them to fly. While I am not a fan of swallows in aviaries, barn swallows seem like the most reasonable choice (given that they perch far more often than, say, house martins, and also sleep while perched). Again, not a great fan, but it is not much worse than the way raptors are usually kept.
 
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