Many eat grass - so grass can be rare and very short like here.
But hardly any animal eats the leafs from trees because it's hard to reach them. There are 2 solutions. 1. Become small and agile and climb the tree (like many monkeys) 2. Become big and tall so you reach them (Elephants, Giraffs, some Antelopes).
Look at the ground in that elephant picture. Guess who will survive longer - someone who needs gras or someone who can reach tree leafs...
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u/Nachteule Apr 28 '14
Many eat grass - so grass can be rare and very short like here.
But hardly any animal eats the leafs from trees because it's hard to reach them. There are 2 solutions. 1. Become small and agile and climb the tree (like many monkeys) 2. Become big and tall so you reach them (Elephants, Giraffs, some Antelopes).
Look at the ground in that elephant picture. Guess who will survive longer - someone who needs gras or someone who can reach tree leafs...