Under some tropical trees (eg eucalyptus) it is impossible to hide on a sunny day, as their crown does

Under some tropical trees (eg eucalyptus) it is impossible to hide on a sunny day, as their crown does not provide shade. What a protective device they have developed to protect themselves from overheating.

Tropical trees growing in hot, sunny climates have a number of structural features that allow them to survive in such conditions. For example, eucalyptus has long, sharp leaves. This allows it to evaporate less moisture. Also, eucalyptus leaves have a glossy outer surface, which allows them to reflect the rays of the sun. All these properties allow the plant to protect itself from overheating. However, due to these features, their crown does not give shade and it is impossible to hide from the sun under them.