They are mostly found around trees since most of the hornbills feed on fruits and make their nest inside the tree holes, which are later sealed by the female, staying with the eggs throughout the whole incubation and the first period of life of chicks, being fed by small narrow hole by the partner. They can also eat insects.
Yellow casqued hornbills or Ceratogymna Elata grow from 70 to 90 cm tall. They are rarely spotted in The Gambia; more often, they can be seen in the Casamance area. They are on the red list category and are nearly threatened.
Because of their size, they also have massive long wings, creating heavy wingbeats accompanied by swishing and buzzing sounds. Also, their voice is very resonant, somehow similar to nasal trumpeting.
Female, Male and Juvenile vary in size and colour of the casque and head. The adult male has distinctive pale blue bare skin around the eye and inflatable throat wattles. Its casque is blackish to creamy on top. Bill is somehow blackish as well. The female is smaller and has a reddish-brown head and neck with some white feathers. Bill and casque are smaller and all creamy. Juvenile is even smaller in size without casque and wattles.
They can be seen mainly on the edges of the lowland and gallery forests of the savanna. They often migrate following the fruiting trees, in pairs or small family parties.