you need to be able to climb trees
Water, and the brain power to use the resources that you find.
kinichiwa amegos
If this is a deserted Island this is strictly a practical consideration. If this is an Arctic Island you will need heavy Arctic clothing If this is a tropical Island you will need clothing to protect you from insects, damage from the environment depending on what you need to do to survive. Shoes for example. Of course a Desert island would be different ;)
Orcas require an ocean to survive and could not live in a barren desert.
fish
coz it does
sticks
Water
Food, Water and protection from the sun.
b'coz they need less water to survive
As camels live in the desert, they need a lot of water to survive. Camels have insulated bodies so as to store water and survive the hot weather in the desert
Ocelots do not live in the desert. Too dry, too hot, no food, and they do not blend in to their backgrounds.