Wednesday, July 25, 2012
Tuesday, July 24, 2012
Tuesday, July 17, 2012
Saturday, July 14, 2012
Cape Robin
Brood parasites
It has been recorded as host of the Red-chested cuckoo.
Food
It mainly eats insects and other invertebrates, supplemented with fruit and seeds plucked from bushes, trees or the ground. It does a lot of its foraging in leaf litter, flicking through plant debris in search of food and occasionally aerially hawking an insect; it may also glean invertebrates from leaves, branches and rocks. The following food items have been recorded in its diet:
Animals
Invertebrates
Insects
Hymenoptera (wasps, bees and ants)
moths and caterpillars (Lepidoptera)
Coleoptera (beetles)
plant and assassin bugs (Hemiptera)
crickets (Orthoptera)
mantids
Diptera (flies)
spiders
earthworms
millipedes
Theba pisana (a species of alien snail)
crustaceans
Vertebrates
lizards
frogs
Berries, drupes and seeds
indigenous plants
Apodytes dimidiata (White-pear)
Asparagus falcatus (asparagus)
Cassipourea gummiflua (Large-leaved onionwood)
Celtis africana (White-stinkwood)
Ficus sur (Broom-cluster fig)
Halleria lucida (Tree-fuchsia)
Ilex mitis (African holly)
Kiggelaria africana (Wild-peach)
Lycium (honey-thorns)
Gymnosporia harveyana (Black forest spikethorn)
Phoenix reclinata (Wild date palm)
Pterocelastrus tricuspidatus (Candlewood)
Rhamnus prinoides (Shiny-leaf)
Rhus nebulosa (Coastal currant)
Rhus pyroides (Common currant)
Scutia myrtina (Cat-thorn)
Coddia rudis (Small bone-apple)
Xymalos monospora (Lemonwood)
alien plants
Acacia cyclops (Rooikrans)
Atriplex semibaccata (Creeping saltbrush)
Hedychium flavescens (Ginger lily)
Lantana camara (Cherry-pie)
Morus alba (Mulberry)
Myoporum laetum (New Zealand manatoka)
Physalis peruviana (Cape gooseberry)
Psidium guajava (Guava)
Rubus (blackberry)
Solanum mauritanum (Bugweed)
Miscellaneous
cheese
butter
leftovers from dogs' bowls
Breeding
Monogamous, highly territorial solitary nester, as the male aggressively defends his territory against other males as well as other species, such as white-eyes, sunbirds and doves.
The nest is usually built solely by the female in about 1-14 days, gathering a clump of material together before shuffling its body into it to form a cup. It is usually made out of bark fragments, twigs, dry grass, fern fronds, rootlets, dead leaves, moss and seed pods and lined with finer fibres, such as hair, rootlets and plant inflorescences. It is most commonly placed in a hollow in an earthen bank, cavity in a tree trunk, densely foliaged shrub, dry flood debris along a stream bank, or in pots or boxes overgrown with vegetation. It has even been recorded to placed the nest in a dried flower arrangement in the lounge of the Grahamstown Golf Club!
Cape robin-chat chick in nest, West Coast Fossil Park, Western Cape, South Africa. [photo H. Robertson, Iziko ©]
Cape robin-chat nest with eggs, Machadodorp, South Africa. [photo Warwick Tarboton ©]
Egg-laying season is from about June-January, peaking around October-November.
It lays 2-3 eggs, which are incubated solely by the female for about 14-19 days.
The female broods the chicks throughout the night and intermittently through the day, for the first 5-11 days of their lives. They are fed by both parents, eventually leaving the nest at about 14-18 days old, remaining dependent on their parents for about 5-7 weeks more. During this period the adults are particularly viglant about protecting their young, sometimes attacking snake such as boomslangs (Dispholidus typus) and Cape cobras (Naja nivea).
Threats
Not threatened, in fact it has adapted to well to the introduction of man-made habitats.
References
Hockey PAR, Dean WRJ and Ryan PG 2005. Roberts - Birds of southern Africa, VIIth ed. The Trustees of the John Voelcker Bird Book Fund, Cape Town.
African Grey Hornbill
Food
It mainly eats animals, such as birds eggs and nestlings, insects, rodents and frogs, supplemented with small fruit. It mainly forages by flying to different bushes, catching prey as it moves; it may also grab animals on the ground. The following food items have been recorded in its diet:
Animals
rodents (Rodentia)
tree frogs
arachnids
insects
Orthoptera (crickets and grasshoppers)
Coleoptera (beetles)
moths and their larvae, caterpillars (Lepidoptera)
Plants
fruit
Ficus (wild figs)
Commiphora (corkwoods)
peanuts
Breeding
It usually nests in natural holes in tree trunks or branches; once a site has been selected the female seals it from the inside with her own faeces. Most of its nests have a "chimney" or "funk-hole", which is a tunnel leading out from the cavity that the female moves into if it feels threatened. It occasionally nests in rock crevices, barbet-made tree holes and nest boxes.
Egg-laying season starts after first strong summer rains, peaking from October-November.
It lays 3-5 eggs at 1-7 day intervals, taking about 6-10 days to complete the clutch.
Incubation is done solely by the female for about 24 days, fed by the male through the small entrance slit.
The chicks stay in the nest for 43-49 days, although the female leaves when the oldest chick is 19-34 days old, after which the chicks reseal the entrance. After fledging the young join their parents on foraging trips, becoming fully independent a few weeks later.
Threats
Not threatened, in fact its common in many areas, especially in the Etosha National Park (Namibia), Hwange National Park (Zimbabwe) and the Kruger National Park (South Africa).
References
Hockey PAR, Dean WRJ and Ryan PG (eds) 2005. Roberts - Birds of southern Africa, VIIth ed. The Trustees of the John Voelcker Bird Book Fund, Cape Town.
Sunday, July 8, 2012
Saturday, July 7, 2012
Spotted Eagle Owl
Name: Bubo aficanus
Description
The Spotted Eagle Owl is a medium to large owl with prominent ear tufts. The upper-parts of the body are dusky brown with pale spots, the under-parts are whitish and finely barred. The facial disk is whitish to pale ochre and the eyes are yellow. Its height is 45cm and its weight is from 480 to 850g. The wingspan is 33cm.Nocturnal hunters, the spotted eagle owl spends most of the day concealed in trees, rock ledges or abandoned burrows.
Size: 45cm, 480-850g
Habitat
Savannah, rocky outcrops, scrub, open and semi-open woodland, semi-deserts.Distribution: Sub-equatorial Africa from Kenya and Uganda south to the Cape
Diet
Invertebrates, small mammals, birds and reptilesReproduction
July-February, 2-4 eggs laid in scrape on the ground, normally sheltered by a bush, grass or rocks. Incubation 32 days. Young leave the nest by about 5 weeks and are fledged by 7 weeks, but remain with parents for at least another 5 weeks.Call
Song is normally 1 or 2 "double hoots", followed by a 3 syllable hoot and then 1 long drawn out hoot hoo-hoo buhoohoo-hooo.Crimson Breasted Shrike
Description
This shrike is extremely nimble and restless, its penetrating whistles often being the first sign of its presence, although it is not a shy species. The sexes have the same colouration and are indistinguishable from each other. A yellow-breasted form is occasionally seen, and was at first thought to be a separate species. Young birds have a mottled and barred buff-brown appearance with a pale bill.Distribution and habitat
This bird occurs in a band from Angola and Zambia to northern areas of South Africa, with large populations in Namibia, Botswana and western Zimbabwe. It generally prefers arid habitats, especially Kalahari thornveld, Acacia savanna and semi-arid scrub, largely absent from desert.Food
It mainly eats insects, gleaning prey from the leaves and trunks of trees, often flying to the ground to feed on ants or some fallen fruit. The following food items have been recorded in its diet:•Invertebrates
•Formicidae (ants)
•Coleoptera (beetles)
•Lepidoptera (caterpillars)
•Fruit
•The invertebrates are usually hawked aerially, killed and then eaten .
Breeding
Both sexes construct the nest, which is a tidy cup made almost entirely of Acacia tree bark, collected from trunks and branches about 50-90 meters from the nesting site and lined with grass and rootlets. It is usually bound with spider web to a fork in the main stem of a plant, or occasionally onto a horizontal branch. Most of the construction work is done in the early morning, and it is usually complete after about 4-6 days. • Egg-laying season is from August-January, peaking from October-November.•It lays 2-3 eggs, which are incubated by both sexes for about 15-17 days.
•The chicks are fed and brooded by both parents, leaving the nest at about 18-20 days old.
•Although they forage independently, they still come back to roost with their parents, sometimes only leaving in next years breeding season.
Subscribe to:
Posts (Atom)