Mobile camps (Serengeti Safari Camp by Nomad, Olakira by Asilia, Serengeti Under Canvas by &Beyond) physically pack up and move 2–4 times a year to follow the herds. You wake at exactly the right point in the migration cycle. Slightly less luxurious than permanent camps but unbeatable for migration timing.
Permanent camps in strategic locations (Sayari, Lamai Serengeti, Lemala Mara) stay put year-round. Great for the 3-month peak window in the north.
For a calving safari, Ndutu's permanent camps (Lake Masek, Ndutu Safari Lodge, Lemala Ndutu) are the right choice.