This was because foresters in Kenya had become concerned that indigenous trees that the railway relied on were getting depleted faster than they could regenerate. To add to the tree species, Mr. H.M. Gardner (Chief Conservators of Forests) also collect indigenous shrubs and trees that were introduced there each year in spite of drought and diseases. Arboretum Forest Station was gazetted as protected Forest Reserves in 1932 and is managed by Kenya Forest Service (KFS).

Mammals: Monkeys – Vervet Monkeys or Black- faced guenon (Cercopithecus aethiops), Sykes or Blue Monkey (Cercopithecus mitis), Kenya Mole rat (Tachyoryctes ibeanus), four- toed hedgehog (Erinaceus albiventris), greater galago, fruit bats, mongooses and squirrels Reptiles: Jackson’s three- horned chameleon (Chamaeleo jacksoni), High-casqued chameleon (Chamaeleo hoehneli), striped skink (Mabuya striata) Birds: African paradise flycatcher (Terpsiphone viridis), White-eyed slaty flycatcher (Melaenornis fischeri), Common bulbul (Pycnonotus barbatus), Malachite kingfisher (Alcedo cristata), African pied wagtail (Motacilla aguimp), Common fiscal (Lanius collaris), Black kite (Milvus migrans), Pied crow (Corvus albus), Hadada ibis (Bostrychia hagedash), Bronze mannikin (Lonchura cucullata), Bronze sunbird (Nectarina kilimensis), Baglafecht weaver (Ploceus baglafecht), Speckled mousebird (Colius striatus), Silvery- cheeked hornbill (Bycanistes brevis) Butterflies: Green- banded swallowtail (Papilio phorcas), Mother-of-pearl (Salamis’ parhassus), African emigrant (Catopsilia florella), Green- veined, White-barred, Black-bordered and Blue spotted charaxes, Diadem (Hypolimnas missipus)

Picnic sites Marked walking trails Bird watching