Danger posed by Nile crocodiles

Nile crocodiles (Crocodylus niloticus, colloquially called ‘crocodile or croc’ in the following) occur in Southern- and Eastern African regions and along the Atlantic coastline in Central Africa. They eat any animal they can get a hold on and are dangerous to humans from a total length of about 2,5 m onwards.

How to spot crocodiles

These crocodiles are living in every bigger lake and perennial river outside of semi-desert areas. On careful observation, either the crocodiles’ heads or backs can be seen in the water or seeing them basking on a sandbank or finding their tracks and scats on the banks. When they are sunbathing outside the water and getting disturbed by humans, their immediate reaction will be to get back into the water. They obviously learned over many thousands of years, that humans are able to throw things from a distance, which hurts.

Nile crocodile tracks on river banks can nearly not be confused with water monitor tracks, as the lateral distance between left and right feet is large and very often, flat areas created by the moving belly can be seen. And crocodile scat looks at first sight very similar like hyena scat. It is the same bright white color, size, and shape, but when breaking apart, crocodile scat got no pieces of bones or hairs inside but is dense and fine-grained like mortar.

Danger of Nile crocodiles

If they are in the water, they are highly dangerous. Swimming in African wild waters is obviously strongly discouraged, as both crocodiles and Bilharzia (caused by parasitic flatworms) are on the prowl for a free meal. Over 90% of crocodile attacks occur either in or near the water.

Therefore, not only swimming, but also wading, fishing, gathering water, cleaning fish at the water’s edge and all such kind of activities are highly dangerous. If using a boat on the water, it should be remembered, that the smaller the vessel, the higher the danger is; as there are many recordings, where crocodiles were lounging out of the water and on to the vessel and grabbed the person.

Suggested behavior of anglers for not getting attacked by crocs

When angling, it is strongly advised to change the location on the waters’ edge every 5 seconds. Nile crocodiles try to position themselves perpendicular to the waters’ edge directly in line with the victim, so that they can shoot out of the water in a straight line. When changing the location very frequently, they will not have the time to take the correct attack position.

Most dangerous time in and on the water or near the waters’ edge is dusk, dawn and nighttime, when they are most active. Once in the morning dusk we saw a crocodile attacking a cow who was coming to drink on the Zambezi river, trying to pull her into the river. Loud mooing alerted the herders, who managed to get her free from the croc with sticks they were punching on to the crocs head.

Finding crocs during nighttime

When dark, it is easy to see their eyes with a flashlight. That’s also the way for humans to catch small Nile crocodiles. Blind them with a flashlight in one hand and catch them with the other hand from behind. But it is very surprising for persons who handle them first time, how strong such only 50 cm long crocs are. Both hands are needed to hold such a baby croc securely in place.

Danger of breeding female crocs

Special danger of crocodiles is in the wet season in Southern Africa, as nesting begins from the first rains onwards (November) and the eggs are incubated for up to 3 months. During that time the female will protect the nest fiercely. So, from the rains in November to the end of the Marula time, there is a heightened risk of being attacked by female crocodiles, when walking in reed beds or densely vegetated areas along water bodies.

Sleeping outdoors near crocodile infested waters

When sleeping outdoors near crocodile infested waters, standard recommendation is to be at least 2 m above the high-water mark and 50 meters away from the waters edge. As I do not know what ‘2 meters above the high-water mark’ is, as pans, lakes and rivers very often got shallow edges without any marks, my recommendation is to stay at least 150 meters away from the water at a well-protected place and out of sight from the water.

Nile crocodiles are not to be under-estimated. They will figure out, when some slow-moving animals (humans) are staying at a place near the water for longer time and will check it out during nighttime. In case of meeting a croc on land close by, best is to run in a straight line away from water. On land crocs can run up to a speed of 17 km/h, which can be surpassed by humans for a short period of time. In water however the swimming speed can be up to 60 km/h of mature crocodiles.

When to do when bitten by a Nile crocodile?

If unfortunate and the croc will bite, it could be a defensive bite, which is one, when after biting it lets go. But if the croc will continue holding on, it will either try to pull the victim into the water or when already in the water will turn around its length axis in multiple spins in order to drown the victim.

Whatever it is, most important is to fight back. Very close by to the teeth are their eyes, which are highly vulnerable, and it has to be tried to poke fingers or the thumb into the eyes. If not possible, the head should be attacked by as many blows as possible. If this is not good enough, the palatal valve in behind the tongue should be opened by hand. It consists of soft tissue, which prevents water from flowing into its body when diving under water, and when opened, will force the croc to release the victim, in order not to drown itself.

When getting bitten, it is important to get professional medical attention as fast as possible, as a high bacteria load in the crocs mouth area will cause severe would infections.

Lessons learned about the danger of crocodiles

  • When on a edge of croc infested water bodies, change location very frequently
  • Never camp closer than 150 meters from waters containing large crocs
  • On land you can outrun a croc
  • When bitten and the croc hangs on, poke fingers in its eyes or try to open its palatal valve in the throat.