I assume your post was tongue-in-cheek, but if it wasn't:
I don't believe for a second that subject matter has anything to do with lockups/freezes. If you've had problems with lockups with owls and teals, it's pure coincidence, unless you are using different settings from when you're shooting shovelers and hawks.
Among other birds that I've photographed recently in the UK are swans, Canada geese species, teals, wigeon, gadwall, shoveler, mallard, herring gulls (BIF), kestrels (BIF), black-headed gulls (BIF), curlew, little tern, chaffinches, robins, siskins, kingfishers, avocets, moorhens, pheasants, coots, blue tits, godwits, brambling, little egret, cormorants, grey herons, golden-eyes, lapwing, carrion crow, pigeons, snipe, mandarin duck, oystercatcher (BIF), great crested grebe, shelduck, turnstones, tufted duck and whitethroat. I also had 10 days in The Gambia photographing a wide variety of African birds including various eagles (BIF), bee eaters, various herons, vultures (BIF) and at least 50 other species. I've also photographed butterflies in flight in Brazil, and literally hundreds of butterfly species in Peru.
I mention this purely to illustrate that in my experience subject matter is entirely irrelevant to lockups/freezes. No one knows for sure exactly what triggers lockups, but it certainly isn't subject matter, and it's unlikely to be related to memory cards unless you are using very slow ones. It's possible that the lockups may be related to unreliable electronic components, but the geeneral consensus is that they are caused by particular permutations of customisation and AF settings that create firmware conflicts.