Cactus
Bring in a real cactus and let your children look at it, and explore the cactus
Desert Sensory Table
Make your sand table into a desert sensory table. Add fake cactuses and fake
lizards. 
Egg Fry
If you live somewhere that gets particularly hot. Take an egg outside and show
your children how that you can fry an egg on asphalt.
Pin the tail on the Lizards
Cut the shape of a lizard out of different colors of construction paper. Detatch the tail and let your children match the tails with the corresponding color of lizard
Spines on a Cactus
Have five potatoes with nail holes on a table. Put a number by each cactus have your children put the corresponding number of spines (toothpicks) into the cactus