In Ethiopia's Lake Tana, are there Nile Crocodiles and Hippopotamuses?

I ask because I don't know if there are any there due to the elevation. Is there anyone who can confirm whether there are or not. I'd appreciate a link with some photographs for any yes answer.

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Answer:
I found Hippos
We will transfer by small plane north to Bahar Dar, the flight taking just one hour. This northern town is situated at 5,700 feet on the southern shores of Lake Tana, the largest upland lake in Africa and the source of the Blue Nile. Beginning here, and meeting the White Nile in Khartoum, this great river makes a 3,500-mile journey to the Mediterranean. We will be transferred to the Tana Hotel, beautifully positioned at the edge of the Lake, for a 2-night stay. Around the Lake and on its islands are medieval monasteries, built here by the Coptic Church in order toescape oppression. In the afternoon a boat trip on the lake is included with a visit to Ura Kidane Meheret Church.By the lakeshore, massive papyrus beds supply the local boat-builders with material for their Raft-like craft in a methodof construction used for thousands of years. The point where the Blue Nile leaves the Lake, a veritable oasis forwaterbirds; you might then watch the sun set over the River and the Lake from a nearby viewpoint. Evening is agood time to watch for Hippos as they leave their watery daytime refuges to graze in nearby meadows.
http://209.85.129.132/search?q=cache:Aeu…

From a 1935 book
A few hippopotami are left in lake Tana, but crocodiles, which are numerous in the Blue Nile, are absent and haven’t been known to pass the lake outlet. …
http://www.jstor.org/pss/1785868