Honestly might be a hot take, but imo madagascar does need atleast 3 more animals to be blue
Madagascar is such a unique and varried space and would really deserve to be treated as its one mini continent as it really kinda is regarding wild life.
There could potentially easily be 10 madagascar animals in the game without it feeling bloated or to much and we really do not have animal variety for there, as its 3 lemures from lemuridae and 1 madagasy carnivore.
A small excursion into lemure taxonomy:
There are 5 extant familys of lemures, lemuridae which all 3 lemures in game belong to, indridae which are indris and sifakas, cheirogladei which are mouse and dwarf lemures, Lepilemuridae also known as sportive lemures or weasel lemures and lastly the aye aye in its own family called Daubentoniidae.
Of these 5 groups, lemuridae make up the vast bulk of lemures in zoos, with mouse lemures slowly increasing in number with the gray mouse lemure being the most common with 22 holdings and juuuuust qualifying to potentially fit habitat animal size with a body and tail each ~15 cm long. All other lemures are extremly rare though, with only 2 species of indridae being kept with the conquerel sifaka (3) and crowned sifaka (6), the aye aye in 7 and no weasel lemures currently being kept at all internationally.
Id say that of the 3 familys kept in captivity one member each would diversify our lemure and primate roster by alot as all 3 of them behave and move significantly different to anything we have in game yet with a leaper, an arboreal squirrel mouse primate and a primate woodpecker and sleep paralasys demon.
Gray Mouse lemure
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Crowned Sifaka
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Aye Aye
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Other habitat animals are really important aswell, with the best spread being atleast one bird (white faced whistling duck my beloved), a tortoise, a turtle and the malagasy giant rat, honorable mention to the nile croc that would also feature in here if other african crocodilleans wouldnt be cooler.
Imo the most interesting and least talked about animal from that group is the madagascar bighead turtle, one of the oldest endemic on madagascar and criticall endangerd, with a species breeding plan set up just in 2018 and since then 7 EAZA zoos welcoming them into their collections.
They are a mid size turtle with a carapace lenght of 50 cm (thx neathlerand wikipedia) and among the oldest living extant beings not just on madagascar but the world, as these guys are relicts from the gondwanan split in the cretaceous period with their line being the only vertebrate group besides madagascar blind snakes that can be traced back for that long.
We need a turtle in the game and these guys are not only about to explode in holdings in the EAZA, they also have an interesting history and are among the most madagascar things on madagascar. It would also add a semi aquatic and can you just imagine building tropical houses with these guys in the water and lemures above? Would be amazing!
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Besides those imo next most important are exhibits.
Madagascar is such a weird and unique places regarding any thing small and quirky with so many unique insects, false iguanas, chameleons, gekkos etc but the one id like to highlight are the mantella frogs, also known as madagascar poison frogs or in german with the very scientific name "colorfull froggys".
They should be VERY easy to add, but africa but especally madagascar could really use some tropical exhibits, so some colorfull new frogs would do the job great and could easily slip with a general "posion frog expansion" where we get 5 at one.
Do i agree with betting on that normaly? No but as its literally different colors on the same model i dont see why we cant have 1 or 2 of these and 3 more South american ones for some colorfull frog exhibit explosion
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I could go on and on but i think i made my point clear that madagascar still has alot to give beyond just standard lemures and the fossa and that we can still crank up the variety of the place up by a ton.
Imo malagasy giant rat, turtle/tortoise + atleast one exhibit would be the bare minimum for blue madagascar and even then id be hoping for so much more.