Lake Shalla is south of Lake Abijatta and divided from it by a narrow strip of higher land, part of the old crater rim. Two rivers feed the lake. It has an area of c.33,000 ha and a shoreline of 118 km. It has several hot, somewhat sulphurous springs around the shore, and nine islands of which at least four are important breeding sites for birds. Bulrushes grow where the hot springs and rivers enter the lake, but most of the shore comprises steep cliffs, thus there is little place for wading birds and there are no fish.
The vegetation to the east and south of the lake is Acacia–Euphorbia savanna, the most common trees being the woodland Acacia spp. (A. etbaica and A. tortilis) and Euphorbia abyssinica, and bushes of Maytenus senegalensis. The woodland around the lakes is important in keeping the highly fragile soil structure intact. In undisturbed/ungrazed areas there is a rich grass and herb flora.
Birds of Abijatta-Shalla National Park
Over 400 species have been recorded from the park. The park is at one of the narrowest parts of the Great Rift Valley, a major flyway for both Palearctic and African migrants, particularly raptors, flamingos and other waterbirds. Among the globally threatened species known from the park are: Aquila heliaca (a rare passage migrant); Falco naumanni (an uncommon passage migrant with a few wintering); Circus macrourus (fairly common passage migrant, with a few wintering); and Acrocephalus griseldis (status unknown). Glareola nordmanni has also been recorded.
Fish-eating birds have mostly abandoned the park since the fish in Lake Abijatta died out. However, huge numbers of many wetland species remain, such as Phoenicopterus ruber, P. minor (the numbers of which fluctuate), Anas clypeata and Charadrius pecuarius.
The fringes of Lake Abijatta form an important feeding and resting ground for waders and ducks, particularly Anas clypeata, Recurvirostra avosetta, Calidris minuta and Philomachus pugnax. Smaller insectivores, such as Motacilla flava and Hirundo rustica, have also been recorded in massive numbers.
The islands of Lake Shalla used to be important breeding sites for cormorants, storks and pelicans, and colonies of Phalacrocorax carbo and small numbers of Pelecanus onocrotalus still occur. One endemic, Poicephalus flavifrons, and five Afrotropical Highlands biome species have also been recorded.
Among the unusual visitors to Lake Abijatta are Calidris alpina, C. melanotos, Charadrius mongolus, C. alexandrinus, Pluvialis fulva, P. squatorola, Phalaropus lobatus, Glareola nordmanni, Grus carunculatus , Netta erythropthalma, Larus ichthyaetus and L. cachinnans.
Key Species at Abijatta-Shalla National Park
Northern Shoveler (Anas clypeata)
Black-necked Grebe (Podiceps nigricollis)
Greater Flamingo (Phoenicopterus roseus)
Lesser Flamingo (Phoenicopterus minor)
Pallid Harrier (Circus macrourus)
Eastern Chanting-goshawk (Melierax poliopterus)
Wattled Crane (Grus carunculatus)
Black-winged Stilt (Himantopus himantopus)
Pied Avocet (Recurvirostra avosetta)
Kittlitz's Plover (Charadrius pecuarius)
Little Stint (Calidris minuta)
Ruff (Philomachus pugnax)
Gull-billed Tern (Sterna nilotica)
White-winged Tern (Chlidonias leucopterus)
Black-faced Sandgrouse (Pterocles decoratus)
Red-bellied Parrot (Poicephalus rufiventris)
White-bellied Go-away-bird (Corythaixoides leucogaster)
Star-spotted Nightjar (Caprimulgus stellatus)
Black-billed Woodhoopoe (Phoeniculus somaliensis)
Eastern Yellow-billed Hornbill (Tockus flavirostris)
Von der Decken's Hornbill (Tockus deckeni)
Hemprich's Hornbill (Tockus hemprichii)
Chestnut-headed Sparrow-lark (Eremopterix signatus)
Boran Cisticola (Cisticola bodessa)
Yellow-vented Eremomela (Eremomela flavicrissalis)
Scaly Chatterer (Turdoides aylmeri)
White-rumped Babbler (Turdoides leucopygia)
Bare-eyed Thrush (Turdus tephronotus)
White-headed Buffalo-weaver (Dinemellia dinemelli)
Rueppell's Weaver (Ploceus galbula)
Speke's Weaver (Ploceus spekei)
Red-rumped Waxbill (Estrilda charmosyna)
Steel-blue Whydah (Vidua hypocherina)