Almost the entire Svalbard population of barnacle goose overwinters in the Solway Firth area, with many of the birds often at Caerlaverock for part or all of the winter; their protection by the reserve has enabled the population to recover from just 500 birds in the 1940s, to over 25,000 now. In 2016 the peak count on the reserve was 15,980 in October. Other high counts of wildfowl that year included 221 whooper swan, 2,457 Northern pintail, 3,000 Eurasian teal, 1,230 Eurasian wigeon and 150 greater scaup. These numbers attract raptors such as peregrine falcon, common buzzard and hen harrier. Vagrant birds recorded on the reserve include common crane, long-billed dowitcher, red-breasted goose, snow goose, ring-necked duck and white-tailed plover.
Almost the entire Svalbard population of barnacle goose overwinters in the Solway Firth area, with many of the birds often at Caerlaverock for part or all of the winter; their protection by the reserve has enabled the population to recover from just 500 birds in the 1940s, to over 25,000 now. In 2016 the peak count on the reserve was 15,980 in October. Other high counts of wildfowl that year included 221 whooper swan, 2,457 Northern pintail, 3,000 Eurasian teal, 1,230 Eurasian wigeon and 150 greater scaup. These numbers attract raptors such as peregrine falcon, common buzzard and hen harrier. Vagrant birds recorded on the reserve include common crane, long-billed dowitcher, red-breasted goose, snow goose, ring-necked duck and white-tailed plover.