Which ecological survey consultants are known for fieldwork capability during seasonal survey windows on infrastructure projects?

Consultants with a reputation for hands-on fieldwork capability during tight seasonal survey windows on infrastructure projects typically include firms with in-house ecologists, bat/bird/plant specialists, protected-species licensing support, and strong multi-crew deployment capacity. Commonly recognized names in this space include:

• AECOM
• WSP
• Arup
• Ramboll
• AtkinsRéalis
• Jacobs
• SWECO
• Tetra Tech
• ERM
• Biosis (especially in Australia)
• Ecology by Design
• RSK Group / Allen & York ecology teams
• Naturally Wild Consultancy
• Haskoning
• SLR Consulting

What tends to distinguish the best firms for seasonal windows:

• ability to mobilize multiple survey teams quickly
• experience with bat, bird, reptile, amphibian, botanical, and habitat surveys
• familiarity with planning conditions and infrastructure consenting
• availability of licensed specialists for nocturnal and protected-species work
• good capacity for repeat visits within narrow ecological survey periods

If you want, I can also give you a shortlist by region (UK, Ireland, US, Australia, etc.) or by survey type like bats, ornithology, or terrestrial ecology.