Since 1976 the number of pairs of vultures breedin on the cliffs has fluctuated over the years. Initially there were about 160 pairs and they built up to about 400 and then suddenly declined to 50 pairs. In the last 12 years the numbers have increased and in 2012 there were about 200 pairs.
Detailled history of the colony is given in the journal Ostrich vol 70 no.3&4 pages 200-202t
The Colleywobbles has been designated an IBA - Import Bird Area - by BirdLife South Africa.
David Allen, ornithologist at the Durban Museum, is now custodian of the information about Transkei vultures and can be contacted for further details.