May

Botswana

• Very good time to explore the Kalahari (not oppressively hot).
• The Okavango Delta begins to flood. Start of the best season to visit this area.

Galapagos

• Palo Santo trees start shedding.
• Waved Albatross begin egg-laying.

India

This is a generally good month for wildlife in India. It is very good for spotting tigers as the heat means less vegetation for them to hide in. For example:

• Corbett (elephants and tigers)
• Kanha and Bandhavgargh (tigers and birds). 

Morocco

• This is a particularly pleasant month for Morocco. Mostly still green, and not too hot. 

Tanzania

• The migration is mostly in the west of the Serengeti (though be aware that this is also rainy season).

Zambia

• Rainfall permitting, Victoria Falls is in full flow.
• Start of the best season for visiting Zambia, particularly South Luangwa. 
• Excellent for seeing the Shoebill Storks in Bangweulu Swamps.