Hippos compete with eachother by standing nose to nose with their mouths open, this is when competing mating. Hippos and crocodiles compete for habitat space and waters, crocodiles will attack baby hippos, therefore they compete for safe space. hippos share their habitat with mostly meat eaters and hippos are plant eaters, the biggest competetion is for habitat space. Invasive species affect the hippos fertilized waters and land , as well as the plants they eat.