Hybrid Ungulates

Other interesting captive hybrid ungulate examples include the subspecifc hybrids between prezwalski and domestic horses and African and domestic donkeys. Visayan spotted deer and Philippine Brown deer hybridises at London Zoo in the 1870s, while Sika and Sambar also were crossbred at the Duke of Bedford’s estate (all of this information coming from messybeast.com, which has an assortment of good information about animal hybridisation and big cat genetics).
 
I strongly suspect both of you are using the same notoriously anti-scientific website as a source :p which lists a lot of ridiculously far-fetched hybrids (including the ones you cite) and even posits that humans did not evolve directly from apes, but are an introgressive hybrid of pig and chimpanzee!
Macroevolution.net?
 
The Siberian roe deer and the Western roe deer are sympatric were the populations meet from the volga river to poland.The hybrids follow Haldane's rule with the fertile females and infertile males.
The hybrids are larger than their parents.
 
A quick google search yeilded no results for such a cross, but both species do make their own hybrids with related genera (gemsbok can cross w scimatars or addax, and sable with roan)
 
In Southeast Asia the ranges of the Gaur and Banteng overlap. Does anyone know of any documented hybrids in the wild or captivity?
 
Isn't that the supposed basis for
the elusive Kouprey?
The idea that the Kouprey was a naturally-occurring hybrid came about through some erroneous assumptions made when studying their DNA, when it was found that Burmese (mainland) Banteng and Kouprey were very similar. The "obvious" conclusion there was that the Kouprey was a result of hybridisation. But when the DNA of Indonesian (island) Banteng was studied it was found to be quite different from that of the mainland Banteng. The current idea is that the Burmese Banteng is the hybrid, not the Kouprey (i.e. the original studies got it the wrong way round).
 
Does anyone know if Bongo and Eland are capable of creating hybrids? I know Eland and Kudu can produce hybrids and the same with Bongo and Sitatunga, but in my research I haven't come across any mention of a Eland/Bongo hybrid.
 
Does anyone know if Bongo and Eland are capable of creating hybrids? I know Eland and Kudu can produce hybrids and the same with Bongo and Sitatunga, but in my research I haven't come across any mention of a Eland/Bongo hybrid.
Common eland have been successfully able to grow bongo fetuses to full-term and birth them, and greater kudu and bongo can hybridize, so I think it is safe to say that eland and bongo would also be able to hybridize.
 
Domesticated goats and sheep have hybridized multiple times in recent years.

I said they *tend* not to be interfertile, not that they are universally incompatible - the hybridisation events to which you refer are exceptionally rare, and the majority end in stillbirth.

Considering how extremely common it is for domestic goat and sheep to be mixed, the fact a case only pops up every year or two on average rather demonstrates how scarce hybridisation is.
 
An interesting one ended up finding some research on, Artificial Insemination hybrids between Pere David's and Red deer:
https://www.deernz.org.nz/public/assets/research/813.pdf
https://deernz.org/public/assets/research/452.pdf
https://deernz.org/public/assets/research/807.pdf
a-very-rare-hybrid-between-a-p%C3%A8re-davids-deer-elaphurus-v0-nsrsmry3fouf1.jpeg
 
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