The best times for birdwatching are from March to April and October to November. Birds found here include ospreys, marbled ducks, cormorants, greater flamingos, flocks of sandgrouse and warblers. But the biggest attraction is the northern bald ibis. These birds, revered in ancient Egypt and once widespread in central Europe, North Africa and the Middle East, are an endangered species, with the world's only sizeable population found on this stretch of coast. Tourism development is an ongoing threat to the four local breeding grounds, which remain off-limits, but you can spot ibises around Oued Massa or at the mouth of the Tamri River.
The park is a great place for walking. Animals such as jackals, red foxes, wild cats, genets and Eurasian wild boars are found here, while a large fenced area in the north of the park contains species that have disappeared from the south, including Dorcas and dama gazelles, addaxes, red-necked ostriches and scimitar-horned oryxes.
Guides can be arranged in the village of Massa, some 60km south of Agadir (signposted from the N1). From there, a track leads along the river to the estuary mouth (5km) and a tarred road leads to Sidi R’bat (8km). This tiny village has two claims to fame. Supposedly it is where the biblical Jonah was vomited up by a whale, and also where Uqba bin Nafi, the 7th-century Arab conqueror of Morocco, rode his horse triumphantly into the sea and called on God to witness that he could find no land left to conquer.