Haller Parkure Trail started as a cement factory in 1954. The factory obtained its raw materials from the quarry, a fossil coral limestone reef that lived 125,000 to 250,000 years ago. In 1971, Rene Haller started a quarry rehabilitation drive with the backing of Bamburi Portland Cement Company. They rehabilitated the southern part of the Quarry that comprised of 75 hectares and northern which was 11 square km.

A variety of game animals and birds, which are not so easily seen, inhabit the fenced area. Each has a function in Nature Trail's ecosystem, and almost all of them utilize a different feeding niche.The mammal species seen are hippos, giraffes, buffalos, zebras, waterbucks, elands and Oryx.The bushbuck, suni and duiker are not easily seen as tend to scamper away upon hearing any sounds. The animals most active at night are: bush pig, marsh mongoose and serval cat.

Below are profiles of famous animals at the wildlife sanctuary:
Sally And Potty, The Hippos

Sally was reared as an orphan by wildlife filmmakers and Joan Root in Naivasha. In 1976, when she was 4 years old, she was brought to Haller Parkure Trail. She is now around 20+ years old and weighs probably 1 - 1.5 tons.

Potty was confiscated from a German zoo, because he was not kept properly, and transferred to Nature Trail in November 1986. He probably weighs between 1.5 - 2 tons.

These hippos mainly feed on soft grass, herbs and fallen fruits. Hippos mainly stay in the water during the daytime, which protects their soft skin from the hot sun, and they feed on land during the night. Defecating mainly in the water, they fertilize the pond and enhance algae growth and fish production.

Hippos mature at 3 - 5 years, have a gestation period of 18 months and live around 40 - 45 years.

Cape Buffalo

Cape Buffalos are African buffalos, and not water buffalos. There are 2 females, one who is fully grown, and the other who was born in Nature Trail in May 1990.

These buffalos feed on grass, coarse grass, herbs and leaves.

African buffalos mature at 3 years, have a gestation period of 11 months and live around 25 years

Waterbuck

There are at present, group of 7 animals, 1 adult male, 4 adult females,
1 male and 1 female calf.

Waterbuck mostly feed on grass, herb and leaves.

Waterbucks mature at 13 - 14 month, have a gestation period of 9 months, and live up to 18 years.

Eland

There are at present a group of 1 male, 2 adult females, 2 calves. Herd of
20 - 25 elands are domesticated at Bamburi Forestry. They are herded and culled for meat

Eland normally feed on leaves of trees and bushes, grass and herbs.

They mature at about 1.5 - 2 years, have a gestation period of 8.5 - 9 months and live 15 - 20 years.

Oryx

There are at present a group of 1 male, 1 adult female, and 1 calf. Herd of
50 - 60 Oryxs' are domesticated at Bamburi Forestry. They are herded and culled for meat. Oryxs' are extremely adapted to life in dry, poor rainfall ar eas.

They feed on grass(coarse and dry), ground fruits, and tuber. They need extremely little water.

Oryxs' mature at 1.5 - 2 years; have a gestation period 8 months and live
19 - 22 years.