what species have been mixed with crocodilians?

[Kakapo]

Tierpark Berlin has this greenhouse with several crocodile species, they're in the same building but in different exhibits and they have crested oropendolas flying around.

And andean cock-of-the rock, various tanager (Brazilian and turquoise at least) and ruby-topaz hummingbird. With american and chinese alligators, false gharial and others.

Also, Faunia have spectacled caiman with ocellated river stingray and eartheater cichlids. Hippo house in Cologne zoo have Nile crocs with a lot of african cichlids. In Acuario Fluvial de Zaragoza, Nile crocs have a mix of african cichlids and Goliath tigerfish.

 

[FBBird]

And andean cock-of-the rock, various tanager (Brazilian and turquoise at least) and ruby-topaz hummingbird. With american and chinese alligators, false gharial and others.

Also, Faunia have spectacled caiman with ocellated river stingray and eartheater cichlids. Hippo house in Cologne zoo have Nile crocs with a lot of african cichlids. In Acuario Fluvial de Zaragoza, Nile crocs have a mix of african cichlids and Goliath tigerfish.

I suppose the short answer to the original question is:
'Lots of things; some of them got eaten'.

 

[natel12]

I don’t know if this was posted but last time I was at the Smithsonian national zoo, they had painted river terrapins in with their Gharials

 

[ZooBinh]

At Cleveland, they have Batagurs, Malayan Painted Terrapins and Fly River Turtles with their Gharial.

 

[JigerofLemuria]

In the Barcelona zoo, there are currently these combinations. Some animals are easier to number than others;
- 1:1 Siamese crocodiles with Mozambique tilapias and grass carps
- 1 Spectacled caiman and 3 Alligator snapping turtle
- 0:1 Chinese alligator (the male is in another enclosure) with giant Asian pond turtles
- 1:1 Yacare caimans with red-eared sliders
- A 5-strong family of Cuvier's dwarf caimans with about 5 red-footed tortoises, 2 West African black turtles, Malayan box turtles and neotropical painted wood turtles.

 

[birdsandbats]

Minnesota Zoo - African cichlids mixed with Congo Dwarf Crocodile.
Milwaukee County Zoo - Red-Eared Slider mixed with Chinese Alligator.
Shedd Aquarium - Many Amazon river fish and Mata-Mata mixed with Dwarf Caiman.